You should be able to find information on unlocked phones on the company of your phone's official website, or if they do not have anything about unlocked phones, you could talk to customer service.
You can buy the iPhone 4S with a wireless service plan or unlocked and contract free. For more information, visit the Related Link.
in order to get an iPhone without a plan the phone needs to be taken to a cell phone store to be unlocked. The iPhone is currently only available for Verizon and AT&T but can be enabled for some prepaid plans. A iPhone without a plan is usually very expensive.
You can give a call to the apple customer support requesting more information about an iPhone 4s. They are a lot of iPhone 4s carriers, such as AT&T and Verizon with different plans. And apple online store also carries unlocked ones.
It needs to be Jailbroken then Unlocked. More info on my site.
Sprint has its own websites for information on their products, contracts and more. Through this website information will be found for the Samsung cell phones.
Yes there are plans for the iPhone with Vodafone UK. To find out about all the different plans for the iPhone you should try to contact Vodafone Uk and inquire about more information.
If you mean the demo when you mention limitation, you'll be able to find it on download.com. You can find more information when the type in iPhone apps.
An iPhone which is unlocked for many purposes which are normally locked. Think about ringtones, programmes and modifying your "desktop" The programmes for a jailbroken iPhone have much more possibilities.
If you are talking about the iPhone, then no. The unlocked iPhone will ONLY be able to run on GSM networks, such as AT&T, in the US. It will not run on CDMA craaiers, such as Verizon or Sprint. This goes for all 3 2012 current iPhone models: iPohne 3GS, iPhone 4, and iPhone 4S. It may also apply to other phones ( e.g. the nexus line of phones, and the htc one S/X
unlocked only means it can be activated on any service, not that the phone is any better, when the iphone came out it was only available on one service, unlocked means you can activate it on any service
To get more information about the iPhone 3g you have two options, either go to a radio shack and ask an employee, or go online to their website and look at information about it.