@pugman227227 You’ll need the device to be unlocked to use a EE sim. Just to add any device from T-Mobile will be a 3G device and 3G is being switched off.
To request the device to be unlock you can USE THIS But depending on the age of the device is might not be possible to get the unlock code as the manufacturer might not have this information as the device is that old
To contact EE Customer Services dial 150 From your EE mobile or 0800 956 6000 from any other phone.
