This may sound like a dense question, but I'm just after clarification.

When my contract expires with my network provider, if I do nothing, will the contract simply keep rolling over on a month by month basis providing me with the same terms and conditions regarding allowances, especially my unlimited internet download allowance.

In reality I'd either upgrade to latest iphone from my 3GS at the time or unlock it (it's an O2) and get a sim only plan somewhere. I'm just curious about what happens if I just don't do anything, and specifically about the unlimited internet (as there's unlikely to be unlimityed internet anywhere in October 2011 when my contract expires).

Thanks.

If you do nothing the tariff will continue as it was whilst you were in contract. You would undoubtedly be able to get a cheaper plan by switching to simplicity though this will cost you your unlimited internet