I have bought an 8250 from India which is configured with Airtel (carrier). I have unlocked the phone & I am moving to UK for a few months.

Will it work there with O2 or will I have to buy a new phone from there?

Also do I have to go in for an 18month contract or will it work with an O2 simplicity. Only Sim. Pay Monthly scheme? I am not going to be there for too long so i dont want to opt for the 18mnth contracts.

Will I get unlimited internet usuage?

Please help me as I am leaving soon & want to know if my phone will work or not.

Thanks.

There is not 8250.
There is a 8520.
It will work as they are also sold in the UK.

It will work on a SIM only from O2, as you can add the Blackberry data to a SIM only on O2.

Thanks for the information.

Will it work with the Pay Monthly (Simplicity scheme) of O2 or do i have to use Pay as you go?

Yes that what I said.
The Simplicity is the SIM ONLY plan. i.e. its a pay monthly no long contract plan.
it wont work with pay as you go, as payg dont have BB data plans on them with O2.

if phone is unlocked it will works with any sim worldwide