My iphone 4 says call failed and message failed?

It was locked to orange but just had it unlocked to work on my T-mobile sim. Had this issue even before I got it unlocked. I have just bought this off of somebody and it keeps saying call failed/call ended just after I have dialled and then when I try to send a message it says message failed, however, I can get onto the internet using my signal alone and not connecting to Wi-fi. Incredibly confused as to why this isnt working. I have full signal. Done a full restore on 2 different computers still with no result. Really at the end of my tether with this, someone please help.
Operating system 4.3.5
Thanks

I faced similar issue where I was getting signal, able to receive calls, use all data services but everytime i went to make a call it said "Call Failed"
You need to try to go to Settings>>Phone>>>Show My Caller ID>> Ensure it is On.
Even if it appears on try switching off and on.
Mine was not allowing to switch off and on but something I did worked and then able to make calls.
Also try Settings>>>General>>>Reset>>Rest All Settings
I faced issue of not being able to make calls after switching my sim card from postpaid to prepaid. First it dint recognise the sim at all then on pluggin in to itunes i was able to activate and atleast receive calls, use all data only everytime i tried makinng a call it said call failed.
When i restored to factory settings it worked. However on restoring my backup i faced the same issue.
Apple local support was most unhelpful saying that i had to forget my data and work with a new phone without contacts, apps, etc

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