As of today 4.3.5 is the highest software version that can be unlocked on an iPhone 4. There is no way to unlock the iPhone 4S whatsoever as I said "as of today."
You will need to purchase a Gevey SIM Card adapter and follow the "Long Method" described below. Remember not to update the software on your iPhone 4 when you plug it into iTunes. This will make the Gevey SIM card adapter useless and you will have to wait for the next unlock solution to be released. This is not expected to happen for a long time so be careful what you click on if you use iTunes. Also, do not ever press the "Erase All Content and Settings" option. This will require your iPhone 4 to be plugged into iTunes and upgraded to the latest software version again rendering your Gevey useless.
If you would like to purchase a Gevey Ultra SIM card adapter that has been pre-tested, just drop me an e-mail at dave77er@yahoo.com and I will send you my ebay link. If you find one elsewhere, that's fine but beware. There are a lot of imitations out there and even the legit one's have about 5% defective rate. I test mine first before I sell them so that my customers won't have that problem.
Since there is only a "tethered" jailbreak available for 4.3.5 at the moment it really isn't worth using for most people. Perform the procedure below and your iPhone 4 will be unlocked within a couple of minutes. You only have to repeat the process if you power off the phone or the battery dies. In most cases turning airplane mode on doesn't seem to be a problem; once deactivated you should get signal again without needing to repeat the procedure:
Gevey Unlock "Long" Method
Turn off your iPhone 4
Insert trimmed SIM card with Gevey underneath.
Turn on the phone and wait for the "Welcome" message.
Click Cancel (This is counter intuitive.)
Click "Settings" then "Phone"
Scroll to the bottom and select "SIM Applications"
Click "Instructions" and follow them. See below.
Go to the phones dialer and wait until you can see one bar in the service indicator area. Do not proceed if it says "No Service" or you will have to start all over.
Once you see one bar dial 112. Wait two seconds and then end the call.
Go back into settings and select "Airplane Mode"
Wait until the "No SIM" message appears.
Deactivate airplane mode.
Now just wait and accept any messages that you see on the screen.
Next you should see "Searching" or two bars of signal strength. Keep waiting.
Next you should see that you are connected to your GSM carrier. If not, start over again.
I will add some photos soon. Tomorrow I will post instructions for 4.3.3
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