I've just bought my Blackberry (8310) this week. I'm going overseas to London and Paris next week. I'm not planning on using my BB for voice calls, but was wondering if e-mail, GPS, and internet will still be functioning?

Moreover, if these things will still function - will I be charged more for using them overseas?

Thank you.

If you've activated International Data service on your account, they will work. I believe this is the $64.95 data plan from AT&T and requires a 1 year commitment.
Without that data plan, it *might* work but you will likely be billed on a per KB basis, which could get very costly.

Call your carrier they will answer all your questions. Make sure you ask them about your data plan.
Careful with ATT