Question

 If you jailbreak your iPhone 3GS can you still pay for apps?

Answer No the data won't delete from the iPhone unless you reset everything
http://wiki.answers.com/Q/If_you_jailbreak_your_iPhone_3GS_can_you_still_pay_for_apps

Top Q&A For: If you jailbreak your iPhone 3GS can you still ...

I have an unlocked and jailbreak iPhone 3g 16gb and i want to know how to add music to it with-out loosing your unlock and jailbreak Can you use itunes and still know that everything will be ok?

I think you could but it may be better if you get dtunes from cydia or installous mainly because it free but a bit slow.
http://wiki.answers.com/Q/I_have_an_unlocked_and_jailbreak_iPhone_3g_16gb_and_i_want_to...

If you jailbreak an iphone do you still have to pay the data plan?

It depends. If you UNLOCK it and put a new SIM in: No. If you just JAILBREAK it: Yes, yes you do.
http://wiki.answers.com/Q/If_you_jailbreak_an_iphone_do_you_still_have_to_pay_the_data_...

You reset your iPhone 3G without copying the apps will you still be able to get them back or download them for free?

Can you buy apps from apps store on your iPhone 3g when unlocked and on tmobile?

I would believe so, it can be difficult to unlock your iphone though but the iphone is exclusively at tmobile in Europe.
http://wiki.answers.com/Q/Can_you_buy_apps_from_apps_store_on_your_iPhone_3g_when_unloc...


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