With the iPhone 4 they want it activated in the store to decrease the number of phones being sold afterward.
1. They don't need to touch the phone, you can do it - in the store.
2. You should ALWAYS open the phone before going home to make sure it works.
3. If you're trying to sell the phone just say it.
Correct, They don't care if your gonna sell the phone and use the old one, there still getting your money from it either way.