Plusnet Mobile with GSM phone?

[#1]

Question is in the subject. My wife has a Nokia 3210 with a Pay Monthly contract (in my name) with EE (Orange). Can she use this phone with Plusnet service?

[#2]

Most likely yes. Even if the phone is locked it should work as both services are essentially EE.

If necessary you can unlock the old Nokias very easily.

[#3]

Hi, 

We do use the EE network to supply our services, but have our own SIM's and work as a separate entity so you would need to get the handset unlocked from EE.