If you've encountered a PDP Authentication Failure message on your iPhone or Android, it means your device is having trouble connecting to the mobile network for data services. This can be frustrating, but in most cases, it's a simple issue that can be resolved with a few troubleshooting steps.

In this guide, we’ll explain what PDP Authentication Failure is, why it happens, and six ways to fix it—specifically for Firsty eSIM users.

What Is PDP Authentication Failure?

PDP (Packet Data Protocol) Authentication is the process your phone uses to verify that it is allowed to access mobile data on a network. If this authentication fails, your device won’t be able to connect to mobile internet.

This issue typically occurs when:

• Your network settings are incorrect

• Your eSIM is not properly activated

• Your phone fails to establish a data session with the mobile network

If you’re using a Firsty eSIM, follow the solutions below to fix this issue and restore your connection.

6 Ways to Fix PDP Authentication Failure

1. Toggle Airplane Mode ON and OFF

A quick fix is to refresh your network connection using Airplane Mode.

📌 Steps:

1. Open Settings on your phone.

2. Toggle Airplane Mode ON.

3. Wait 10 seconds and toggle it OFF.

💡 This forces your device to reconnect to the mobile network.

2. Enable Data Roaming (Required for Firsty eSIM)

If Data Roaming is OFF, your device may fail to authenticate with the network.

📌 Steps to Enable Data Roaming:

• iPhone: Go to Settings > Cellular > Cellular Data Options > Turn ON Data Roaming.

• Android: Go to Settings > Network & Internet > SIMs > Turn ON Data Roaming.

💡 Firsty eSIM requires Data Roaming to be enabled to function correctly

​3. Restart Your Phone

A simple restart can resolve minor connection issues.

📌 Steps:

1. Power off your phone completely.

2. Wait 30 seconds.

3. Turn it back on and check if the issue is resolved.

4. Reset Network Settings

If the issue persists, resetting your network settings can help.

📌 Steps to Reset Network Settings:

• iPhone:

  1. Go to Settings > General > Transfer or Reset iPhone.

  2. Tap Reset > Reset Network Settings.

  3. Enter your passcode and confirm.

• Android:

  1. Go to Settings > System > Reset Options.

  2. Select Reset WiFi, Mobile & Bluetooth.

  3. Confirm and restart your phone.

⚠ This will reset WiFi passwords, cellular settings, and VPN configurations, but won’t delete your eSIM.

5. Check Your Firsty eSIM Activation Status

If your eSIM is not correctly installed or activated, it may cause PDP Authentication Failure.

📌 Steps to Verify eSIM Activation:

• iPhone:

  1. Go to Settings > Cellular.

  2. Check if your Firsty eSIM appears under SIMs.

  3. If it’s OFF, tap it and enable "Turn On This Line".

• Android:

  1. Go to Settings > Network & Internet > SIMs.

  2. Make sure your Firsty eSIM is listed and turned ON.

💡 If your Firsty eSIM is missing, reinstall it through the Firsty App.

6. Contact Firsty Support

If none of the above steps work, reach out to Firsty Support for assistance.

📌 How to Contact Firsty Support:

• Open the Firsty App and go to the Support Section.

• Choose Live Chat or Email Support for assistance.

💡 Our 24/7 multilingual support team is available to help you resolve PDP Authentication issues quickly.

Final Thoughts

PDP Authentication Failure can usually be fixed by resetting your network settings, enabling data roaming, or verifying your eSIM installation. If you experience this issue with your Firsty eSIM, follow the troubleshooting steps above or contact Firsty Support for help.

With Firsty, staying connected should be hassle-free—no physical SIM cards, no unnecessary roaming charges, just seamless global connectivity. 🚀