Get a free PAYG SIM from another network, say O2 and try it out.
Welcome to the EE Community.
In addition to @XRaySpeX's great suggestion, you can find out more information in Unlocking your EE mobile phone or device.
Hope this helps.
@donnalivie, if you know anyone on another network, you could always try their SIM card to see if the phone is unlocked.
One of these options may help you find the answers you need.
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