I have Meizu m3s and 2g and 3g network doesn’t work. 4g works. I update to 188.8.131.52G but it didn’t fix my problem.
Mobile netwrok state is disconnected, however it is written in Network carried Drillisch network current and seems connected. (It is O2 network in Germany). My sim card works in different phone.
Thank you very much for your suggestion and help