My Iphone is not recognizing my SIM card...I've tried two cards but no luck...please help...

I tried putting two SIM cards in my iphone. It intially recognizes it, but it can't text, 1 out of 5 call attempts are successful. The rest is all good, but it's not like a phone anymore..

Are thses actual microSIMs or regular SIMs that have been cut down?
IF they have been cut down, it's possible they were not cut properly and are not making contact resulting in marginal performance.
If they are microSIMs then it's possible the iPhone is experiencing a hardware issue.    

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