when my contract is up in september (a while off I know) would I be able to keep it?

I get 500 mins,500 text unlimited landline calls and unlimited internet based on a fair use policy and pay £20 a month and it suits me fine. Its a tmobile deal and I cannot see the offer in store and I know the offers change all the time in there but just wondered when september arrives can I just pick a new phone and continue the deal as normal?

You'll certainly be able to keep the package but it may restrict the handsets you can get free or at a competitive price. You'll only know that for sure at upgrade time.