Currently Being ModeratedJun 22, 2013 11:50 PM (in response to jenssenaliman)
The function is Mobile carrier dependent.
That is to say some carriers make a charge for activating the function and additional charges for subsequent data use.
You need to check the terms of your local carrier first.
If they support the function request setup and pay any fees applied.
You will be sent a configuration profile vis SMS to activate the function.
Clicking on the SMS powering down and restarting the device will unlock the function on your phone.
NB.If you have an unlocked iPhone or are in a few countries above may not be necessary.
Just follow to steps below
At this point tap settings/Personal Hotspot and slide the toggle switch to on
Set a Wifi Password.
You may be asked to turn on Wifi -this switches priority to transmit rather than receive
You can now share your 3G/LTE (or GPRS/Edge very slow !) with upto 5 other devices.
3 devices may connect via the Wifi link
1 no via Bluetooth
1 no via USB cable
Best avoiding Bluetooth if possible as it wrecks the battery life and is severely bottlenecked on bandwidth.