Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
IPhone Buying Guide
Where the android is offering dozens of phones in the market, there Apple Inc. has released only five models of the iPhones only. In this only three models are being offered by Apple and the U.S carrier which is AT&-T, Sprint and Verizon. If you are planning to buy a brand new iPhone or have decided to upgrade to a latest model, there are three available options for you: the iPhone 3GS, the iPhone 4 and the iPhone 4S.
The Budgetary Level
The question is that not very often you go to buy a shiny appliance, so you have to keep in close consideration as to how much amount of money you are willing to pay. If you are deciding to buy an iPhone for your own use, than you might probably spend a few bucks more. Every carrier has the policy of selling iPhones that are brand new with a two-year contract which means that whichever model of iPhones you have selected, you are paying at least $1700 per year of the contract.
The iPhone 3GS can be obtained free of cost from the Apple store, but you will have to sign a two-year contract with AT&-T to obtain the model free of cost. On the other hand, apple is also selling an unlocked version of iPhone 3GS at a cost of $375. Moreover, AT&-T is the only carrier which supports iPhone 3GS and is only compatible with GSM based network of the carrier.
An 8 GB iPhone 4 is also a good option who wants to save some of their money. The cost of this iPhone is $99 along with a two-year contract which can be signed with all three of the network carriers.
Then there comes the latest model of the iPhone – iPhone 4s. The 16GB model is tagged to be $199 and $299 and $399 for 32GB and 64GB respectively. Again the contract is of two years and can be signed with all the carriers.
The hardware of all the three iPhones does not hold much difference but the accoutrement of iPhone 4 and 4S is more readily available in the market. Moreover, all the models also support iOS 5 which is an excellent mobile operating system. It all depends on how each iPhone performs on a single feature which is present in all.
Processors: These are the major functioning aspects in which the iPhone 4S uses the same A5 chip designed by Apple and also powers up iPad 2. The iPhone 4 includes an A4 processor which is not as fast as the latter one. The 3GS processor is comparatively low functioning but will be noticed when you have used the latest versions.
Displays: The Retina display has been made part of the iPhone 4 and 4S. This application is particularly an excellent feature and is so densely made that the eye cannot make out for separate pixels. The display of 3GS is not so impressive but is legible.
In addition o these features there are several other features as well which distinguishes all the three models from the other and its related information can be obtained from various online sites which will definitely help you in making the correct decision.