I have had Plusnet broadband and more recently phone for some years and found service fine. I have over the last 4 or 5 months gone over to Plusnet mobile from EE too. The mobile service seems to work fine apart from the annoyance of not being able to text shortcode numbers if you wish. However the operation behind the scenes doesn't seem to run so smooth .
I have 2 phones on Plusnet mobile taken out a a few months apart. Both had a week or so of difficulties when attempting to number port which seems a common issue on Plusnet mobile ( haven't ported before so can say how it goes with other networks). Now a little way on I have changed plan on one of the mobiles, had all the texts to say it would change at the end of Feb. Latest bill arrived, still on original plan. Contacted customer services through chat which worked well and they were very helpful but it appears again the system has failed somewhere, as it was all there on the screen that the plan change had been submitted but it hadn't happened for reasons unknown. Has now been resubmitted for end of March so hoping it works this time.
So come on Plusnet please get these things working better behind the scenes as I've had 3 out of 3 failures so far with changes to my mobile accounts be it the more technical job of number porting or a simple plan change.
