Reception issues

[hetaman22]

Hi i've been having an ongoing issue with my xperia z1.

for some reason my z1 cannot receive cellular network yet i can connect to carrier network and surf the net etc but cannot send or receive a text message or even a simple call to my carrier providers, it says there is no service available but i have full bars and connected the there network. 

i've tried my sim in another handset to which it works fine. able to send and receive texts/phone calls 

would like to get it fixed without hving to spend needless amounts of money. 

i've unlocked the bootloader etc but to still no prevail. 

somebody please help???

[Sam]

If you have unlocked the bootloader there could a large number of reasons for this error and we may be a little limited as to what we can advise you to do. Have you already loaded a custom ROM on your handset and if so have you checked to see if this is a known issue with the ROM you have loaded.

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[hetaman22]

thanks for the reply.

i have had this issue long before i unlocked the bootloader. i unlocked it thinking that it will solve the issue but it hasnt and i am just lost on what to do next. have updated it to the latest 4.4.4 firmware but still doesnt work the way i want it to. it works just like a normal phone but will still not send or receive a text or phone call, just comes up with "connection problem or MMI code" message