pinephone drops cellular network

[bcnaz]

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^
My phone is almost stock Mobian and still had the issue.

> Not certain what you mean by "Stock Mobian"  ?
   The back cover says "Mobian" ?  ( that would still leave standard or convergent models.)

There has not been any main-board revisions since the first batch of Manjaro phones.
 The Mobian Edition came next, then they went back to Manjaro.
    ( if you do have a Mobian edition phone, Then it Does have the latest main-board revision )

BUT IF  this is a hardware issue,  then it does not matter what operating system you are using.

> Back on my Brave Heart phone,  there was a time I suspected that the phone had a modem problem, but unless it "Healed Itself"
  I was mistaken, because it worked pretty well after the software progressed a little bit.

My Brave Heart is on vacation for now,  as I have a new convergent main-board sitting next to it, 
  and I have since purchased, 3 PMOS and 1 Manjaro convergent phones.

Since that time in early 2020, I have not experienced any  "Modem appears not to be functioning"  type of problems"....

>>  Recently some forum members have had problems where their modems would not wake up after entering deep sleep,
     But I think that was just a hic-up in the software as it progresses.

**  I think the Front running "Best 3 operating systems" appear to have got past that point.

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Flashing the 'firmware' is not normally in an operating system update.