debian+phosh running on PinePhone

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Have you attempted data or hot spot yet ?  Verizon may work different than my AT&T.
I can connect to the web, but cannot use it...  AT&T tells me I "do not have a data plan"   Though I do indeed.
( I talked to their tech for over an hour, they could see my phone but could not resolve the problem. They said they would send me a new sim card )

RE: Mobile Carriers: You might want to consider contributing to one of the existing threads where other users share their experiences with carriers like Verizon and ATT.

United States

If you don't see a thread for your country, you may want to make a new thread for it in General. There will undoubtedly be other users having similar experiences who would benefit from your investigations.

All distros will have the same support for the same carriers so it is a general topic.

The other user experience issues you mentioned about the Chatty app, could be sent to https://source.puri.sm/Librem5/chatty/issues/