Most devices are what's called 'locked' to the network.
This means the device will usually only work on that particular providers network. So for example, you've had a phone on contract with Vodafone then after your contract has ended, you buy a SIM-only deal with say O2, but the O2 SIM will not work in your device as Vodafone have locked it to their network.
You may also need to get your handset unlocked if you want to use a local SIM card in your handset when travelling abroad to avoid roaming charges.
There are really only four (4) mobile networks in the UK and it is usually one of these providers that you need to contact to get your phone unlocked.
These providers are: O2, Vodafone, EE, Three
(Remember, T-Mobile and Orange now fit under the EE banner)
| Provider | Charges | Unlock Details |
|---|---|---|
| EE | PAYG - No Charge Contract - £8.99 or Free after contract period Non-Customer - £8.99 (iPhones activated after Sept 2015 will auto-unlock after 18 months) |
Unlock your phone |
| O2 | PAYG - £15 (after 12 months) Contract - Free |
Unlock your phone |
| Three | Usually sold Unlocked (after 1st Jan 2014), but if locked it's free to unlock | Unlock your phone |
| Vodafone | PAYG - Free (after 30 days) Contract - Free (after 3 months) (Worst provider to unlock if you don't have an existing business relationship) |
Unlock your phone |
You can see more information on this topic from the regulator OFCOM.
OFCOM are currently holding a consultation on proposals to stop mobile networks locking phones to their own networks.
