Server Error

So yesterday a friend said he had an iPhone 5S. I tried my SIM card in it. it didn't work, I put my sim card back in the phone I was temporarily using because my other phone screen had broke. The phone I was temporarily using screen had stopped working so I put my SIM card back in my cracked screen phone.. Well now when I try and make phone calls outgoing calls I get a Server Error: try again later. incoming calls go straight to voicemail. I can receive text messages but I cannot send them. I am able to use data ex. facebook Instagram etc..

anyone have an idea of what is going on?

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