Sorry to hear that you can't make any calls, I can only imagine this must be frustrating for you as I would be lost without my phone.
This is probably a silly question but have you activated the SIM? Also are you able to send / receive texts?
I ask these questions just to gain a better understanding of what you've done so far in attempts to get it working.
I look forward to hearing form you,
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Thanks for letting me know you've sorted it now.
I'm glad to hear it's all been resolved, Just remember if you get any future issues then just post back here and we'll be more than happy to help.