Overview

A PDP (Packet Data Protocol) error usually means your phone cannot establish a mobile data connection with the network. This is often related to coverage, an incorrect eSIM being active, or a temporary network issue. The good news is it's usually easy to fix.

You might see a message like: "Could not activate mobile data network. PDP authentication failure."

Note: A PDP error does not mean your eSIM is broken.

Check Your Coverage First

Before changing any settings, make sure you're in a location covered by your eSIM.

• Check your eSIM's product page and confirm your current country or region is included in the coverage list
• If you're outside the coverage area, your phone won't be able to connect even if everything else is set up correctly

iPhone

If coverage looks good, try the following steps in order:

1. Restart your iPhone
2. Toggle Airplane Mode on for 10–20 seconds, then turn it off to refresh your signal
3. Check that the correct eSIM is active — go to Settings → Cellular / Mobile Data → SIMs and make sure your Simify eSIM is turned on. If you have multiple eSIMs, turn the others off

Tip: If you have multiple eSIMs in your SIM manager, the Simify eSIM is usually the one at the bottom of the list.

Android

If coverage looks good, try the following steps in order:

1. Restart your device
2. Toggle Airplane Mode on for 10–20 seconds, then turn it off to refresh your signal
3. Check that the correct eSIM is active — go to Settings → Connections → SIM Manager and make sure your Simify eSIM is turned on and set as the preferred data SIM

Still Not Working?

If none of the steps above resolve the issue, reach out to the Simify support team via live chat or email at hello@simify.com and we'll help get you connected.