well first off it depends on what company you choose. either Verizon or at&t. with at&t you will probably, if you want unlimited, pay about 100 dollars for the one line excluding how much you pay for the actual iphone, they can range from 200 dollars to 600 dollars all depending on GB size, the highest is the 64gb. but if you don't want unlimited and want a flexible plan that works for you, you will probably be spending roughly 70 dollars a month.
This will be dependant on your current network supplier and the supplier you are transferring to. Normally MAC codes are free (the code you need to transfer networks). If you are not changing networks speak to your existing supplier, they will not usually charge for changing plans but some do. Any charges (if any) will vary from company to company.
It is $9.99 to add a line with at&t. It's called at&t friends & family however iPhone's require the unlimited data plan which costs extra. hope this helps.
No
Depends on how much the regular phone cost. 3GS with a new plan at AT&T is only $100 4G with a new plan is only $200 With out the plan and going off eBay prices you can see yourself paying anywhere from $200 to $600 depending if you want it unlocked or jailbroken.
Yes, you have to have a data plan with AT&T or any other mobile phone company to place calls or use 3G. The data plan is approx. 30$ extra a month on top of the regular phone line costs.
It is $30
depends on your plan.
$200 with a two year plan
The iPhone has to have a data plan because of all the cool features so you have to pay the $30.00 fee every month. I do not think they charge you to switch from a regular phone to an iPhone. I know they will not sell you one if you do not buy the data plan but it is pretty expensive so... I guess that is why they charge. The data plan is important.
If on a plan you can get it for 69 dollars a month
$199
You can turn off the iphone data plan. Simply get another phone and call at&t and tel them you dont want the iphone anymore they will ask you for the ESN of the new phone and you are done. I know that when you get the iphone they say "your signing a contract to keep the iphone plan for the life of the iphone" but they dont make you as long as you have a new phone that line will be associated with
Regular plan depends on plan
Sprint has the cheapest iPhone plan right now. You can get an iPhone plan from them right now for only $69.99.