Ipod touch 5th into iphone, so it can call text using a sim card?

What is it called. Its a type of thing that you can attach into an ipod touch 5th so it can call an dock type of thing… Someone help me…

Added (1). I need it for the 5 th generation!

Peel 520

You can't get a PEEL 520 for the 5th generation (unlike the other answer states)

But there isn't anything available yet for the 5th generation that I know of.