[HELP] Couldn't connect to my network although my phone sees it!! topic

hey everyone, after i updated to B-125 international the device wont connect to my network, always showing no service, although when i search for networks manually the phone sees all the available networks but wont connect to mine, i tried my sim on different phone and it works, aslo i tried different sim and it didnt work, any help with that?

p.s. the imei is present