Random notifications about removing a SIM card with a request to restart the device, what is the true reason?

Question

Android

Just two weeks ago I bought myself a samsung galaxy s4 sgh-i337 from AT&T (unlocked) at a ridiculous price. Before buying, the phone was thoroughly tested, immediately upon arrival in Tula, I inserted a new SIM card from tele2, and from that moment, after a completely random time, it began to issue alerts that the SIM card was removed and asked for a reboot (in the end, I was not able to systematize the appearance of this problem, flashing did not help as well as modem firmware) I, in turn, without hesitation, wrote off all the troubles on tele2 and bought a SIM card from a megaphone, with which I successfully passed a week and a half using the device to the maximum. Everything would be fine, but having arrived for the weekend in his native outback in the city of Aleksin, he again saw this phantom alert. In general, the question is, is it possible to somehow pick up native firmware to solve this problem, so that at least this dialog box does not block the operation of the entire system? Or is it all about SIM cards, with which our operators work a little differently than the same AT & T?

Answer 1

Are you sure that the problem is not the base station of your outback? Where was the week during which everything was ok?