Tell sometimes long calls are dropping in my iphone?

Its on ios 6.1.3 when i contacted apple care, they asked me if i'm using micro sim,
i told before it was nt micro but shopkeeper made it micro by hand cut with cutter,
they told me to use micro sim thats factory cut not hand cut,
they told many customers don't know that hand cut micro sims can make iphone hang, can damage sim tray, it starts to heat up,
please tell is this true?

Brother? Throw the iPhone out the window. I'll buy you a Galaxy note.