# eSIM Compatibility

## Can I use an eSIM instead of a physical SIM?

**Yes**, you can use eSIMs with WhatSnap SMS if your Android device supports eSIM technology.

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**eSIM Benefits**: Use local numbers from other countries, activate remotely, and manage multiple numbers on a single device—all without physical SIM cards.
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## Checking if Your Phone Supports eSIM

### Android Devices

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#### Open Settings

Tap your phone's **Settings** icon
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#### Select 'About Phone'

Scroll down and find **About Phone** or **About Device**
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#### Look for 'SIM Status'

Tap on **SIM Status**, **SIM card status**, or similar option
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#### Check for eSIM Support

Look for an **eSIM** or **Embedded SIM** mention in the list

If you see eSIM information displayed, your device supports eSIM technology.
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#### Still Unsure?

If eSIM is not listed, your phone might not support eSIM technology.

Visit your phone manufacturer's website for definitive eSIM compatibility information.
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### Popular eSIM-Compatible Phones

**Google Pixel Series:**

* Pixel 3a and newer
* Excellent for WhatSnap SMS gateway

**Samsung:**

* Galaxy S20 and newer
* Galaxy Note 20 and newer
* Select A-series models

**Motorola:**

* Razr series
* Edge series

**Other Brands:**

* Many newer Android phones (2020+)
* Check manufacturer specifications

***

## Use of eSIMs for Overseas Numbers

### Send SMS from Another Country's Number

You can use an eSIM from another country to get a local number, even while physically located elsewhere.

**Example Scenario:**

* You're physically located in Australia
* Purchase a US eSIM from a US carrier
* Connect to WiFi (turn off cellular signal to avoid roaming)
* Send/receive SMS with a US local number
* Recipients see a US phone number (local presence)

**Benefits:**

* Local presence in multiple countries
* No international SMS charges (uses WiFi)
* Manage multiple country numbers from one device
* Perfect for agencies with international clients

### Requirements for Overseas eSIM Use

To use an eSIM from another country with WhatSnap:

1. **eSIM-Compatible Android Phone**
   * Must support eSIM technology
   * Check compatibility above
2. **eSIM from Desired Country**
   * Purchase from carrier in target country
   * Must support SMS over WiFi
3. **Enable RCS for WiFi SMS**
   * **Critical**: Turn ON RCS in Google Messages
   * Required for eSIM to send SMS over WiFi
   * See: [RCS Settings Guide](https://whatsnap.gitbook.io/whatsnap-docs/faq/sms/rcs-settings)
4. **Reliable WiFi Connection**
   * Disable cellular signal to avoid roaming charges
   * Keep WiFi enabled and connected
   * SMS sends over internet connection

{% hint style="warning" %}
**Important**: When using eSIM from another country over WiFi, you **must enable RCS** (Rich Communication Services) in Google Messages. Without RCS, SMS will not send. See our [RCS Settings Guide](https://whatsnap.gitbook.io/whatsnap-docs/faq/sms/rcs-settings) for details.
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***

## Avoiding Global Roaming Charges

### How to Use eSIM Without Roaming Fees

**Step-by-Step:**

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#### Enable WiFi Calling

The eSIM carrier must support calls and SMS over WiFi/internet.

1. Open **Phone app** on Android
2. Tap **More** → **Settings**
3. Tap **Calls** → **Wi-Fi calling**
4. Enable **Wi-Fi calling** if available

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**Note**: Not all carriers support WiFi calling. Check with your carrier before purchasing an eSIM plan.
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#### Disable Cellular Signal

Turn off mobile data to prevent roaming charges:

1. Open **Settings** → **Network & Internet**
2. Tap **Mobile network**
3. Select the eSIM
4. Toggle **OFF**: Mobile data

**Alternative:** Enable Airplane Mode, then turn WiFi back on.
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{% step %}

#### Enable RCS

Required for eSIM SMS over WiFi:

1. Open **Messages** app
2. Tap profile icon → **Settings**
3. Tap **RCS chats** or **Chat features**
4. Toggle **ON**: Enable chat features
5. Wait for "Connected" status

See: [RCS Settings Guide](https://whatsnap.gitbook.io/whatsnap-docs/faq/rcs-settings#when-to-enable-rcs)
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#### Connect to WiFi

Ensure stable WiFi connection:

1. Connect to reliable WiFi network
2. Verify internet connection works
3. Keep WiFi enabled at all times
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#### Test SMS Sending

Before connecting to WhatSnap:

1. Open **Messages** app
2. Send test SMS to your personal number
3. Verify message delivers successfully
4. If successful, proceed to WhatSnap setup
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   {% endstepper %}

***

## Purchasing eSIMs for International Use

### General Considerations

**Verification Requirements:** Most countries require ID verification to purchase an eSIM. You may need:

* Driver's license from that country
* Local address
* Government-issued ID
* Phone number for verification

**Challenges:**

* Difficult to register numbers outside the country
* Many carriers require you to be physically present
* Verification processes vary by country

{% hint style="warning" %}
**Disclaimer**: The options below are compiled from WhatSnap user experiences. You must do your own due diligence before purchasing any eSIM to ensure it meets your requirements. WhatSnap is not responsible for eSIM carrier operations or their plans.
{% endhint %}

### Option 1: Tello (USA eSIMs)

For users outside the US who need a US number, **Tello** has been successfully used by WhatSnap clients.

**Website**: [tello.com/buy/esim](https://tello.com/buy/esim)

{% hint style="warning" %}
**Tello Limitations**:

* Very cheap provider with aggressive blocking
* Start **extremely slow**: 1 SMS every 10 minutes maximum
* Max sustainable volume: 100-150 messages/day
* Requires careful warm-up over 2-3 weeks
* SMS with links sometimes don't send
* Accounts randomly stop working
* **Only recommended if you have no other options for a US number**
  {% endhint %}

**See detailed Tello setup guide**: [Getting a US eSIM from Outside the US](https://whatsnap.gitbook.io/whatsnap-docs/faq/sms/getting-us-esim)

### Option 2: Get Your Client's ID

If setting up for a client:

1. **Explain the Need**: Tell client you need their ID to verify and order their SIM
2. **Request Required Documents**:
   * Driver's license or ID
   * Address verification
   * Any carrier-specific requirements
3. **Order on Their Behalf**: Use their credentials to order the eSIM
4. **Connect to Your Device**: Use QR code to activate eSIM on your device

{% hint style="info" %}
**Client Trust**: This is similar to getting access to their social media accounts. Most clients understand this is necessary for SMS setup and will provide documentation.
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### Option 3: Get Someone in the Country to Order

If you have contacts in the target country:

1. **Find Local Contact**: Friend, family, or business partner
2. **Have Them Order**: They purchase eSIM using their credentials
3. **Screen Share Activation**: During activation, screen share to see QR code
4. **Scan with Your Device**: Scan QR code to link eSIM to your phone

**Benefits:**

* Legitimate local purchase
* Easier verification
* Better carrier compliance

**Considerations:**

* Requires trustworthy local contact
* May need to reimburse them for purchase
* Ongoing billing may need their card

***

## Setting Up WiFi Calling for eSIM

### Android WiFi Calling Setup

**To enable WiFi calling on Android:**

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{% step %}

#### Check Carrier Support

Not all carriers support WiFi calling. Verify before purchasing:

1. Visit carrier's website
2. Look for "WiFi calling" or "Calling over WiFi" feature
3. Confirm it's included in your plan
   {% endstep %}

{% step %}

#### Enable WiFi Calling

1. Open **Phone app**
2. Tap **More** (⋮) → **Settings**
3. Tap **Calls**
4. Tap **Wi-Fi calling**
5. If available, toggle **ON**

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**If you don't see WiFi calling option**: Your carrier doesn't support this feature. You may not be able to use this eSIM for SMS over WiFi.
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#### Configure Emergency Address

Some carriers (like Tello) require a US address for E911:

1. In WiFi Calling settings, find **Emergency Address**
2. Enter a valid US address
3. Save the address

**Don't have a US address?** You can:

* Enter any valid US address (often not verified)
* Use a physical address service: [physicaladdress.com](https://physicaladdress.com)
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{% step %}

#### Test WiFi Calling

1. Enable **Airplane Mode**
2. Turn **WiFi back ON**
3. Try making a call or sending SMS
4. If works, WiFi calling is active
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### Google Support Resources

**Official Google documentation:**

* [Make calls over WiFi - Android](https://support.google.com/phoneapp/answer/2811843?hl=en)
* [Enable WiFi Calling - Samsung](https://www.samsung.com/us/support/answer/ANS00082122/)

***

## eSIM Best Practices with WhatSnap

### Device Configuration

**For eSIM-only setups:**

1. ✅ Enable RCS (required for SMS over WiFi)
2. ✅ Connect to stable WiFi network
3. ✅ Disable cellular data (avoid roaming)
4. ✅ Configure WiFi calling with carrier
5. ✅ Test SMS before connecting to WhatSnap

**For Dual-SIM (eSIM + Physical SIM):**

1. ✅ Choose which SIM WhatSnap should use
2. ✅ Configure RCS if using eSIM
3. ✅ Test both SIMs can send/receive independently
4. ✅ Consider using separate devices for each SIM (cleaner setup)

### Volume and Warm-Up

**eSIM warm-up is critical:**

* Start even slower than physical SIMs
* 1 message every 10-15 minutes for first week
* eSIM carriers are often stricter
* Monitor for blocks carefully

**Recommended volumes:**

* Week 1: 10-15 messages/day
* Week 2: 20-40 messages/day
* Week 3+: 50-100 messages/day (maximum)

See: [Database Reactivations - SIM Warm-Up](https://whatsnap.gitbook.io/whatsnap-docs/faq/sms/broken-reference)

### Carrier Selection

**Direct carriers vs. Resellers:**

* ✅ **Direct carriers** (Verizon, AT\&T, Vodafone): Better for business use, higher limits
* ⚠️ **Resellers** (MVNOs like Tello): Cheaper but stricter limits and more blocks

**For eSIM use, prioritize:**

1. Carriers with clear business use policies
2. Documented WiFi calling support
3. RCS compatibility
4. Good reputation with WhatSnap community

See: [SIM Plan Recommendations](https://whatsnap.gitbook.io/whatsnap-docs/account-management/sms/sms-specifications#sim-plan-recommendations-by-country)

***

## Troubleshooting eSIM with WhatSnap

### Messages Not Sending

**Problem**: eSIM connected but messages won't send

**Solutions**:

1. ✅ Verify RCS is **enabled** (most common issue)
2. ✅ Check WiFi connection is stable
3. ✅ Verify WiFi calling is enabled
4. ✅ Send test SMS from native Messages app first
5. ✅ Restart device and WhatSnap Gateway app
6. ✅ Check eSIM plan is active and has SMS capability

### eSIM Won't Activate

**Problem**: Can't activate eSIM on device

**Solutions**:

1. ✅ Verify device supports eSIM
2. ✅ Ensure strong internet connection during activation
3. ✅ Try scanning QR code on different screen
4. ✅ Contact carrier for activation support
5. ✅ Check device isn't carrier-locked

### WiFi Calling Not Available

**Problem**: Can't enable WiFi calling

**Solutions**:

1. ✅ Verify carrier supports WiFi calling
2. ✅ Check eSIM plan includes this feature
3. ✅ Update device to latest Android version
4. ✅ Contact carrier to enable on their end
5. ✅ Try alternative carrier with WiFi calling support

***

## Related Resources

* [RCS Settings Guide](https://whatsnap.gitbook.io/whatsnap-docs/faq/sms/rcs-settings) - Required for eSIM over WiFi
* [SMS Device Specifications](https://whatsnap.gitbook.io/whatsnap-docs/account-management/sms/sms-specifications) - eSIM-compatible phones
* [Getting a US eSIM from Outside the US](https://whatsnap.gitbook.io/whatsnap-docs/faq/sms/getting-us-esim) - Detailed Tello setup
* [Database Reactivations](https://whatsnap.gitbook.io/whatsnap-docs/faq/sms/broken-reference) - Volume guidelines
* [SMS Troubleshooting](https://whatsnap.gitbook.io/whatsnap-docs/account-management/sms/troubleshooting) - Common issues

***

## Summary

**eSIM Compatibility: YES**

* ✅ WhatSnap works with eSIMs
* ✅ Requires eSIM-compatible Android device
* ✅ Must enable RCS for eSIM over WiFi
* ✅ Disable cellular to avoid roaming charges

**Best For:**

* International presence with local numbers
* Multi-country operations
* Remote team with centralized SMS
* Testing multiple carriers without physical SIMs

**Not Ideal For:**

* High-volume campaigns (physical SIM more reliable)
* Users unfamiliar with WiFi calling setup
* Countries with limited eSIM carrier options

{% hint style="success" %}
**eSIM Success**: With proper configuration (RCS enabled, WiFi calling setup, careful warm-up), eSIMs can be an excellent solution for international WhatSnap SMS operations.
{% endhint %}

***

**Need Help?** Contact WhatSnap support at <support@whatsnap.ai> for eSIM setup assistance and carrier recommendations for your region.
