How to erase a sim card

[Guest]

Hello,
I have a Samsung Straighttalk phone and I am selling it. I need to know how to erase the Sim card and the phone memory.

Thanks,

 

[John1234]

Have a look at this. Let me know if this helped u http/www.lazybit.com/index.php/2010/12/06/how-to-clear-sim-cards?blog=2