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No. Each carrier has allowed cell phones for their carrier. If you have a GSM carrier though, you can buy an unlocked phone to use on that carrier even if the carrier doesn't support the phone. All you do is move your sim card.
A consumer can compare long distance carrier phone plans online on many different sites. One site is called Phone Dog, and it allows the consumer to compare providers, services, rates, and other information.
There are several websites that allow you to compare cell phone plans. Http://compare-cell-phone-plans.net/ and Http://cnet.phonedog.com/cell-phone-research/compare-plans.aspx are both good sites to compare plans. You may want to review plans with the actual company. I know my carrier is constantly changing and adding wireless plans.
There are various websites which allow you to compare mobile phone plans and companies. One such website is http://www.moneysupermarket.com/mobile-phones/ where they give a listing of competing companies and plans!
Most cell phone companies have family plans. The one with the lowest fees would probably be AT & T or Verizon Wireless. They can run as low as $99 per month.
T-mobile has some of the best prices for cell phone plans out of all the major carriers. AT&T also has good low price cell phone plans. Most carriers however do offer low cost plans, but they have less features than the more expensive plans.
Any wireless carrier that supports or features Sony Ericsson phones will have the latest models. You can also purchase phones from online cell phone giant Wirefly. They have a huge selection of phones and plans from every carrier. You can even compare phones and plans side by side.
IP and digital PBX may be related to each other because IP is already digital wherein it uses internet and data networks to transmit multimedia like voice, fax, message, music, etc. Some of the types of PBX systems are: Virtual PBX Phone System IP-PBX Phone System PBX Phone System You can check virtualpbxcompare.com to see provider's listing in extended table of all the feature, price and plans for their system.
Free cell phones with cheap cell phone plans for Verizon Wireless, T-Mobile, Sprint, Free Cell Phone Offers and Deals for T-Mobile, Verizon Wireless, and Sprint start a new wireless account/2yr contract with the phone's wireless carrier.
Most modern plans include calls nationwide, but check with your carrier; some older plans may only include local calls.
AT&T carries the best plans for Samsung Slider phones. You can find out more baout their plans at www.wireless.att.com/cell-phone...phones/slider-phones.jsp.
Although marketing and advertising promote the idea that family cell phone plans are designed for immediate family members, there is usually no solid rule that actually enforces this idea. One efficient use of some family cell phone plans is to add friends that are frequently called, but that have a different carrier or only a landline. This allows calls to be made without charges, or with the reduced rates that family cell phone plans offer.