* Universal Unlock sim card for mobile phone It can unlock most of the mobile phone on the market.

* Use C8051F304 chip produced by America, when compare to 12F683, F304 perfected a lot. As F304 adopt 16-24M frequency, with faster data processing speed than 12F683.

* There are some compatibility problems of this cards former version, such as: it cant read HKs 3G card of Vodafone/Snartone.

* Virtue: thinner, work stable, with short mobile phone entrance stand-by time, compact IC volume, and cutting a little few sim card. High CPU work frequency, rapid identify card speed, infrequent machine freezed / died.

* Defect: high price, original STK menu was screened, cant start up. One single card with many numbers not available to swith, compatibility need to keep up improve