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$200 with a two year plan
$599.00 without a contract. This is what I was told at Best Buy.
1 billion dollars
go to the apple website and check
It depends on which country you are in and which plan you are on, but for a two year contract (which seems to be the minimum) it's around $2000.
No.You can use an iPhone without a plan. Know that in order to not use a plan on your iPhone, you must purchase an unlocked iPhone which is normally priced $450 USD more than its contract counterpart in Apple Stores, AT&T, Verizon, Sprint, etc. Of couse if you are already in a 2 year contract and your 2 years are up (or you pay a heavy fee to ditch your contract), your iPhone will not have a plan but will still be able to function like an iPod Touch. The last was to get an iPhone with no plan is to buy a used iPhone 5 from someone who's contract expired (which won't really be possible until fall 2014).
$100 with a two year plan
=In the U.K its between £300.00 and £500.00;==Although in the U.S it is much cheaper=
With 2 year activation at AT&T you can get a 16GB iPhone 4 for $199 or a 32GB iPhone 4 for $299. A data plan is also required, the minimum cost $15/month and gives you 200MB of data per month. You will also need a messaging/calling plan.
There is not a price attached to the rumored iPhone 6. The device will most likely cost around $500-600 without a contract.
The Verizon iPhone 4 is listed at $449.99 when purchased without a contract. When one signs a 2 year contract, however, one can receive the phone free.
The price for an iPhone does not change paced on age. The price for the iPhone itself is between $199-$299 (16GB and 32GB). Then you have to choose between the at&t plan or the Verizon plan. There are multiple possible plans per company with differing prices.