Just a few I can think of off the top of my head:
EE ONE and EVR (Thanks Bubbles for adding to this)
1P Mobile TLP
CMLink CMI and TSL (Depending on SIM? Unsure if both are used now?)
Ecotalk TSL
Lycamobile LYC
NOW Mobile NOW
Plusnet TSL
Popit TSL? (Not 100% sure my memory serves correctly)
Spusu SPU
TalkHome THM
Utility Warehouse TLP
O2 TEL
Giffgaff GGF
Tesco TSC
Three HTG
Smarty LCS
I THINK all of the above ones are correct but if someone notices...
One more for you;
Stour Marine (07537 1) SML
Thanks, that's the one! I knew it rang a bell. I tried to port an SML number a couple of years back and it turned out they don't have a porting agreement with Vodafone. I'm not sure if there are others they also don't have agreements with but I'm now put off of trying due to the issues caused last time (recipient SIM went inactive and never came back).Z
Just a few I can think of off the top of my head:
EE ONE and EVR (Thanks Bubbles for adding to this)
1P Mobile TLP
CMLink CMI and TSL (Depending on SIM? Unsure if both are used now?)
Ecotalk TSL
Lycamobile LYC
NOW Mobile NOW
Plusnet TSL
Popit TSL? (Not 100% sure my memory serves correctly)
Spusu SPU
TalkHome THM
Utility Warehouse TLP
O2 TEL
Giffgaff GGF
Tesco TSC
Three HTG
Smarty LCS
I THINK all of the above ones are correct but if someone notices...