I’ve managed to get a fairly standard TPU case from Amazon, which will do the job for now. Usually I design my own custom (Prince themed) ones from Casestation, but last I looked they didn’t have P6Pro ones available yet.
The slipperiness wasn’t an issue in-hand. But when placing the phone down on a variety of surfaces (even relatively flat ones) it just wouldn’t stay put. Even on the couch it seemed to have a life of it’s own and migrate itself down the sides of the cushions The case has solved that though for sure.
They are a big upgrade over last year’s QC 35ii , more controls over playback from the device itself , more granularity on noise cancellation and it remembers your last noise cancellation level and better build quality, basically fixed all my pain points with the QC35ii.
Music also seems better but I haven’t tested for that long.
It is a dead simple process to add it to your phone, I can only talk for Vodafone but it was a simple self service option on their web login ( not app afaik) , but be aware that most or all UK operators only offer esims on contract plans.
Since EE and three often share masts and downtime is often one of them doing maintenance I’d go Vodafone or O2 , if you’re okay with cashback deals check HotUKDeals for some cheap deals.