No Connection to Carrier from Pinephone 3G Model

[ThrillGates]

I got my Pinephone 3G Ram Model and can't get a mobile connection.
The Signal strength is always at 0.

The same SIM Card is working without problems on my old Braveheart edition.

I Tested multiple distros, some could read out the carrier name but all have 0 Signal.
Also factory test says "Not Registered" and signal strength of -90db.


Could my modem be broken?

Currently postmarketos is installed.
How to debug this?

Thank you.

A few questions to try to help resolve your issue.

1. Which carrier are you using?
   
2. Did you put a PIN on your SIM card with the SIM Lock feature on your BH?
   
3. Did you manually enter APN settings on your 3GB?
   
4. Do you have another SIM card to try on your 3GB? If so, are the results any different?