How much does an Iphone 6 cost paying cash?

I would prefer to pay cash then to pay the extra amount buying it on payments. Wouldn't it be cheaper in the long run just paying cash?

Yes, unless someone offers 0% interest for a period of time.

The price of an iPhone is region dependent. In the US its probably $750 for the 16GB but in my country its $1200 for the same model.

In cases like this the word 'cheap' can mean different things. You can have the phone on contract and then you'll have the left over money for other expenses that may be more urgent. Or, if you have enough cash handy you can get it outright and not waste money on a contract plus you get more freedom. Both methods save money in their own ways.

However, there's another option that I've been using for a few years now. 3 years ago I saved up for a really long time to get the best phone money could buy. Then the next year when there's an upgrade, just sell the old device and add like $200 on top to get the next phone. Its a very convenient method that doesn, t sap your cash immediately or even overtime.

I would advice not to pay outright if you still need money for some other stuff. I used to think that was the way till I lost so much money. If phones were offered on contract in my country I would take that option so that it would be just like another bill waiting to be paid. However, if you have some extra money right now without any pressing expenses that need attention then go for it then you can follow the process I outlined above.

Hope this helps!