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A SIM lock , simlock , network lock or subsidy lock — not to be confused with PIN or PUK code — is a capability built-in to GSM phones by mobile phone manufacturers. Network providers use this capability to restrict the use of these phones to specific countries and network providers. Currently, phones can be locked to accept only SIM cards from one or more of the following:
- Countries (the phone will work in one country, but not another)
- Network/Service providers (e.g. AT&T Mobility, T-Mobile, Vodafone, etc.)
- SIM types (i.e. only specific SIM cards can be used with the phone).
In most countries, most mobile phones are shipped with country and/or network provider locks. In addition, these locked phones tend to have firmware installed on them which is specific to the network provider. For example, if you have a Vodafone or Telstra branded phone in Australia, it displays the relevant logo and may only support features provided by that network (e.g. Vodafone Live!). This firmware is installed by the service provider and is separate from the locking mechanism.
Most mobile phones can be unlocked to work with any GSM, such as O2 or Orange (in the UK), but the phone may still display the original branding and may not support features of your new carrier. Most phones can be unbranded by uploading a different firmware version, a procedure recommended for advanced users only.
While the real Vertu-Nokia Ferrari V47i cell phone retails for $25K US Dollars, this V47i is only a fraction the price. Boasting the same features, such as genuine leather back and stainless steel back. The V47i is Tri-band GSM 900/1800/1900 (for T-mobile, Cingular, non-850mhz ATT), works World-Wide and is Unlocked.
You right, GSM unlocked phone SIM, CDMA phone work. Make if buy a phone internet it GSM 850 GSM 1900 if cingular, overseas phoens do GSM 850 be in trouble
The 3.0" Tri-band GSM A99i Cell Phone is a mix of the iPhone and Samsung Instinct with just a slight touch of gold. Available in black or gold the a99i also has a long list of features such as dual sim, dual standby, dual bluetooth, mp3, mp4, fm radio, camera, and touch screen. Unlocked, the A99i works with T-mobile, Cingular, and non-850mhz ATT.
An iPhone clone? An HTC Diamond clone? Neither. The 3.0" TouchScreen DigitalRise X99i' outer appearance resembles the HTC Diamond. The GUI has iPhone-like icons. The X99i adds onto technology of both. With dual sims, dual standby, dual bluetooth, dual loud speakers and FM Radio, the unlocked X99i can work with ATT, Cingular and T-mobile.
Cell Phones from China are getting more and more advanced. The first iPhone clone CECT P168 did not have Java 2.0, Windows Mobile, GPS or WIFI but it still sold well. Nowadays, Chinese Phone makers are aiming past the market leaders like iPhone and Nokia by releasing unlocked WIFI and GPS models that can be used with T-mobile, Cingular and ATT.
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