a. The global first releasing, no need to cut unlock SIM card "3G-SIM", released on 6th August and compatible with all countries 3G iPhones. b. Dispense with cutting the SIM card, never lose signals, used for global iphone(SIM card) c. works perfect on EDGE and WIFI network Improved disavantages: a. Lose signals. -----Now we completely solved & renovated the problem, it now no any signal losing. Also our friends in HongKong, Shanghai and Foreign Countries already did testing while driving 100 more miles. Never lose signals now!!! b. Can not reget signals in non-signal area! Now we successfully solved it, one can get signals fast in subway, lift, underground carport, safe cabinet or steel cabinet etc, as if one NEVER USED our "unlock SIM card"! c. Works on 3G network, we did testing on all "3G telephone company" and the on-working "2G telephone company" in HongKong. All works perfect. d. Blocking card problem! Many users had the old version unlock SIM card blocked together with the SIM card in the phones and hard to put in and take out. Our new generation unlock SIM card already solved the ploblem entirely. And its special design now no need cutting the "unlock SIM card" before using. e. Additionally, the "3G-SIM" version unlock SIM card is compatible with any country's locked iphone 3G mobile, the unlocking function is no limit on different version 3G iphone for different countries. It is really called " one card for global" and worthy of the name. How to unlock and use this SIM unlock card: Mobile phone 1. Prepare your SIM card, turbo SIM and pen knife. 2. Cut your SIM card according to the turbo SIM IC chip. 3. Place your SIM card together with turbo SIM and put in to your mobile phone. Now your mobile phone is unlocked. iPhone 1. Open the SIM tray of iPhone by ejection tool 2. Put the SIM unlock into the slot of SIM tray 3. Attach SIM card together with SIM unlock 4. Slide the SIM tray into the iPhone SIM cabinet