Nexus 4, cant make calls

[Rory Poole]

since christmas my nexus 4 has had more and more trouble making calls, now I cant make or receive any calls, it has android 4.4.2 a moded version , I have been trying to understand how to reinstall 4.4.2 I have given up on upgrading android as there is too many ways to mess it up, I just need to be able to use it as a phone, 10 years a go I studyed networking and IT but this makes me feel so stupid, when I try to make a call it just said dialing and and counts the seconds connected? but I can hear nothing, sound is at max, same with reserving a call, my phone is used for all my internet access, as I can not get a line installed in my flat, and the local library blocks a lot of sites like this one on modding phones as it is counted as hacking! so I have to do it in one go.
any help getting my phone working would be welcome

 

[Rukbat]

I'd first bring it to the carrier and see if they had any ideas. (An intermittent SIM card could be causing the problem.)

 

[Rory Poole]

3G internet access works fine as dose texts so I dont think it is the sim, and I got a sim only deal so I will get no help from them, at christmas I tried out some new apps, I have uninstalled them all today but it made no difference.