An unlocked phone can accept the SIM card from any cell phone provider. If you have an ATT SIM card, you can use it in an unlocked phone. A locked phone is created by the provider to force the use of its service; an unlocked phone can take any SIM card.
Yes. Prices vary for locked and unlocked phones (unlocked generally being a bit more expensive). The Nokia 1100 can be bought, with no contract, from eBay and Amazon amongst others.
Yes, RadioShack does carry cell phones. They sell phones with plans, no contract phones as well as unlocked phones. You can have a look at all they have to offer here: http://www.radioshack.com/category/index.jsp?categoryId=4235714
Yes you can get unlocked phones online which can be used on any carrier. One of the best places to find unlocked phones is ebay.
does cell mart sell unlocked phones
Get a "pay as you go" phone plan. You only pay when you use it. No contract. Depending on the carrier you should be able to use any unlocked phone.
no
Buying new, unlocked phones or unlocking your existing phone is legal in the U.S.
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 unlocked phones from internet sellers. For example, http://www.amazon.com/Unlocked-Phones-Accessories-Cell/b?ie=UTF8&node=283273011 and http://www.cellhut.com/.
Unlocked phones can become non-functional but this is rare. When changing carriers, you may need to configure your unlocked phones and sometimes foreign phones may experience compatibility issues.
Unlocked phones can be purchased directly from the phone's maker, as well as popular retail sites like Amazon. Unlocked phones are harder to find because of legality issues in some countries.
You can purchase unlocked cell phones from specialty sites such as http://www.puremobile.com/. It would be a good idea to do a search for unlocked cell phones on the internet, and to look for a reputable company.