Question

 How do you use an iPhone to tap into another iPhone?

Answer you do not ( you can not do that )
http://wiki.answers.com/Q/How_do_you_use_an_iPhone_to_tap_into_another_iPhone

Top Q&A For: How do you use an iPhone to tap into another iP...

Can iPhone Sim Cards be swapped into another iPhone If so what is the process after you put the Sim in the other iPhone?

Yes it can be swapped. I actually swapped my razr's sim card to my iphone. Nothing happened. It works perfectly.
http://wiki.answers.com/Q/Can_iPhone_Sim_Cards_be_swapped_into_another_iPhone_If_so_wha...

IPhone 3GS to iPhone 4. I just bought a iPhone 3GS the day before the iPhone 4 was announced. Is there any way I can return mine with the money going towards the iPhone 4?

I'm assuming this is old as the iPhone has been out awhile, but no there is no return policy with Apple or AT&T.
http://wiki.answers.com/Q/IPhone_3GS_to_iPhone_4._I_just_bought_a_iPhone_3GS_the_day_be...

How to Reboot Your iPhone After Changing It Into Another Language?

Whenever you change a major setting on the iPhone, such as the language setting, it is best to reboot the phone to ensure the changes have fully taken effect. When changing the language on the phon... Read More »
http://www.ehow.com/how_8482318_reboot-after-changing-another-language.html

How can you transfer your phone book contacts from one iPhone 3g to another iPhone 3g?

you would just have to retype them into the contacts list or plug both phones on for charging into the computer and drag the contacts from one to the other
http://wiki.answers.com/Q/How_can_you_transfer_your_phone_book_contacts_from_one_iPhone...


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