Applying anysim or other software so I can sell my iphone

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I have ziphone installed on my 1.1.4 iphone. With the new ones comming out it is now time to sell. I have a customer and I have a question about installling the proper software so he can use the phone as well. I am a legitimate customer of AT&t so I know I have to keep my sim cad before I send the phone. But what software should I install on the phone when I send it to him. I saw anysim but there was no version for 1.1.4 Also whichever software that you recomend do I install it then take out my sim card or do I install it without a sim card? Thanks for the help, I tried to look online but could not find an appropriate answer.