Hmmm it depends aswell if you have ever reset your network settings as that resets your data usage and i can't see a lifetime option anywhere. Only for calls and even that resets.
I reset mine as was having some probs a while ago and ive only used 178mb in 2 months so hopefully i will be ok with 500mb
Dilema now is do i pay £180 to get out of my contract (ends apr 11) sell my 32gb 3GS for £250 therefore giving me £70 towards the cost of the new phone.
OR
Do i wait till my contract ends go onto simplicity and wait for iPhone 5
OR
Wifes Contract on hers ends June next year. So get iPhone 4 now then when 5 Comes out get it on her contract and give her the 4
I think i know which option i'll use