[burnsguitarman]

Hi, I have searched all pages of this thread, and still need help! I have 2 contracts with T Mobile which I am very happy with!
However, I have now got an unlocked and jailbreaked (not sure what it means) original Iphone, I have an O2 Iphone PAYG sim which I can use, but the call prices are very high and would rather use my T Mobile sim and keep my number.
If I did this and added web and walk to my package what services would I be able to use for free (part of my contract) and what would I pay extra for? Would I be able to pick up and receive emails? browse the web, download the free apps from the apple store etc.
Any info would be welcome. By the way, I only have 2 months of my contract with T Mobile left so can leave soon if I need to! Thanks for reading!