I own an old Oppo Find 7 phone. Quite high spec for what it is.
I charged it up and inserted my Plusnet sim tonight and the carrier is showing as T-Mobile which was a bit of a shock. When I set it to EE it lost the signal and reset itself back to T-Mobile. The APN shows as EE Anywhere so I'm slightly confused now. Some of the APN settings such as the Proxy and a few others weren't set so I entered them from the example shown on here but the carrier still shows as T-Mobile.
My other phone that I normally use is a WileyFox Swift and the network is correctly shown as Plusnet on that.