Just to add an update to this, I went on live chat and they want an extra £16 along with me re-contracting to move up from M500 to Gig1.
They also said that I wouldn't get Gig1 if I got an O2 PAYM SIM as I wouldn't be eligible for the free speed boost as I have offers on my account and the only people that get the free speed boost are those without offers on my account.
I didn't think that was the case but I also didn't want to accuse the person on live chat of just trying a hard sell on me!
Does anyone know what the actual deal is and the best (read: cheapest!) way to get an upgrade from M500 Oomph to Gig1 (I don't even need a Virgin SIM if they would cancel that to credit some of the cost against the Gig1 service)?
I currently have M500 and a 5Gb Oomph SIM showing on my account. Does this mean I have M500 or I have M350 "boosted" to M500 with Oomph? If the latter, will it boost again to Gig1 with Volt?
Taking out a PAYM SIM (just to leave it in a drawer!) with O2 for £10 a month (USwitch offers one for £8 a month but it doesn't guarantee that's direct with O2 which I imagine it has to be for Volt to be added) then seems the best bet for me and I can then add Volt which will get me Gig1 speeds?
It seems a bit silly to have to take out an O2 SIM that I'll never use but if that's how I'll get the best deal... 🙂