Your phone can become blocked in a number of ways - one of them is if you enter your SIM card PIN number incorrectly three times.

But don't panic, you can unblock your SIM card with something called a PUK (Personal Unblocking Key).

This PUK is an eight-digit code designed for situations like this - it can unlock your phone or your USB stick.
Get your PUK code from My EE

Here's how. First sign up for My EE, or log in. Then:

• click Manage device > Device > DEVICE CONTROLS
• you will see your PUK code under Unblock SIM (PUK code)

Please enter your PUK code carefully - if you enter the wrong PUK code 10 times, you will permanently block your SIM card and we'll need to send you a new one.