Should i sell my iPhone?

[Venga]

Heya guys, i've had an iPhone 3Gs 16GB Black for around 10 months now and think its a wonderful piece of kit, yet i feel i don't use it to its full potential. I would most likely switch to a Blackberry because the main reason i use my phone is more communication not entertainment.

So heres a few questions to BG;

1) How much should i sell my iPhone for? It doesn't have ANY scratches on it due to being screen protected and cased. It's boxed with everything that it came with and on Orange network.

2) Because im on contract, would i be able to use my iPhone sim in a Blackberry. Is 3G geared towards BB?

3) Whats Blackberry should i get?

Ill probably drop a few more questions in later on, but any info / opinions would be great!

[antihero]

1) http://shop.ebay.com/?_from=R40&_trk...All-Categories
2) Get an Android phone
3) Samsung Galaxy S