Unlocking an iPhone allows it to be used with unsupported carriers (ex. T-Mobile instead of AT&T in the US) and the iPhone 4 unlock was released on Tuesday, August 3, 2010 at around 11:30 PM PST by the iPhone Dev-Team. This is incredibly simple to unlock your iPhone 4. Here's the steps: 1. Jailbreak your iPhone 4 2. Open Cydia,Manage,Sources,Edit,Add 3. Add the source: repo666.ultrasn0w.com 4. Remove SIM card if haven't already 5. Search for and install ultrasn0w 6. Reboot iPhone If no signal is found, go to Settings and turn on Airplane Mode, then turn it off. If you still have no signal, reboot the iPhone. ------------------------------------- How to Jailbreak iPhone 4 www.youtube.com ------------------------------------- iPhone Dev-Team: blog.iphone-dev.org F0recast ih8sn0w.com ------------------------------------- My Website: techgeec.com Follow Me twitter.com

Koolertron(TM) Iphone 4 4S Dual Sim Adapter 2 SIM Card Power Case Battery Quad band 850/900/1800/1900Hz Black

• Compatible with all iPhone 4 4S(even blocked / SIM-Lock)
• Power extender for your iPhone 4 4Sbattery
• Both SIM cards signal strenght appear on your iPhone 4 4Stouch screen
• Both battery level status are shown on your iPhone 4 4S touch screen
• GSM Dual Band:850/900/1800/1900Hz

Features:

Compatible with all iPhone 4 4S(even blocked / SIM-Lock)

Two SIM cards in your iPhone 4 4S

Simultaneous connection

Both SIM cards are active at the same time

Power extender for your iPhone 4 4Sbattery

Both SIM cards signal strenght appear on your iPhone 4 4S touch screen

Both battery level status are shown on your iPhone 4 4S touch screen

Compatible with any providers SIM or USIM cards

Does not require to cut your SIM cards

Avoid roaming charge
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List Price: $ 149.00

Price: $ 89.99