No connection to internet without wifi :/

[elode]

Hello 
I received my pinephone pro in February 2022.

I installed postmarket os and it works pretty well, except for one thing:
I can't connect to the internet without wifi. In other words, as soon as I leave my house, I no longer have access to the Internet.
I looked in the settings and there, I checked "Mobile Data" and "Data Roaming".
In the advanced settings > Access Point Names, I chose the one that seems to me to be the one that corresponds to my provider… nothing helps.

Any ideas?

Thanks