Can't get any signal after the phone was locked with Android device Manager - Xiaomi Redmi Note 3 Questions & Answers

Hi there,
A friend of mine lost his phone a few weeks ago so he locked it via android device manager.
Luckily the mobile was found and is up and working now (no data erased, just got a new sim from the carrier as the previous one has been locked too) but it can't get any signal (he is on giffgaff if that matters).
We tried to swap slot in the sim tray with no success. All I can say is his sim is properly recognised on my iPhone and my sim does get the signal when put into his xiaomi, so we can possibly exclude a hardware failure.
Curiously enough when he logs himself on Android device manager through the app all options are greyed out, but it does not happen if he uses the web version (all options are available). Might this be somehow related to the phone's inability to get the signal?
He is currently on MIUI GLOBAL 8.0.1.0.0 stable (no Roms were flashed since he bought the phone)
Any help will be appreciated!
Sent from my iPhone using Tapatalk

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