Looking for some help please,

I`m a complete novice with my iphone 3GS and not technical in the least!

I have a pay monthly sim and have been given the mobi by my son as his little brother lost my mobi last week

I had it unlocked at the weekend and Cydia was installed although not really sure what this is

Does anyone know if I`m able to get Internet access set up for iPhone 3GS?

Is there a way to receive my picture messages?

Had no help when I called Virgin they say they don`t deal with Iphones.

Any help is greatly appreciated.

Ringsnthings x