TroubleshootingUpdated: January 10, 20262 min read

Fix: PDP Authentication Failure Error

Getting a 'PDP Authentication Failure' or 'Could not activate cellular data network' error? Here's how to fix it.

The "PDP Authentication Failure" error means your phone cannot establish a data connection with the network, even though the eSIM is installed.

This is usually a settings or network selection issue.


πŸ”§ Quick Fix Steps

Step 1: Toggle Data Roaming

  1. Go to Settings > Cellular (iPhone) or Settings > Connections > Mobile Networks (Android).
  2. Ensure Data Roaming is turned ON βœ… for your Roamiya eSIM.
  3. Toggle it OFF and ON again to refresh the connection.

Step 2: Restart Your Phone

A simple restart often clears this error:

  1. Power off your phone completely.
  2. Wait 10 seconds.
  3. Power back on.

Step 3: Re-select the Network

  1. Go to Settings > Cellular > Select eSIM > Network Selection.
  2. Turn Automatic OFF.
  3. Wait for available networks to appear.
  4. Select the carrier listed in your Roamiya confirmation email.
  5. Turn Automatic back ON.

πŸ’‘ How to Check My Data Usage?

If your internet feels slow, you might be out of data or hit your daily limit. πŸ‘‰ Guide: How to check my data usage


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