Unlock iPhone 4 4.3.5 iPhone 3GS 4.3.5 (06.15.00)

STEP 1: Turn off your iPhone and insert your SIM card and I-SmartPhone SIM together with the metal SIM tray provided.

STEP 2: Turn on your iPhone and wait for the SIM welcome menu to show and the select “accept”.

STEP 3: At the beginning a “no service” message will show on your iPhone 4. DON’T do anything and wait until you see one signal bar appear on the top left corner.

STEP 4: After you see the signal bar dial “112′ and hang up within 2 seconds.

STEP 5: Turn on “Airplane Mood” and then turn off right away. Your iPhone 4 will show “SIM failure” and then “No SIM Card Installed”

STEP 6: Until the “No Sim Card Installed” message shows up turn on the “Airplane Mood” again and turn it off right away again. The “Sim failure” message will show and the signal will show up after a few seconds.

NOTE:

After all the steps above, if there is still no signal then power off your iPhone 4 and turn back on and repeat all the steps from beginning.

To use 3G network you need to turn on “Data Roaming”.