When 3 take over o2

[Anonymous]

Hi all.
just having a beer after work in the beer garden and got to wondering when 3 take over o2 how do they "unlock " your mobile phone so it can receive the 3 signal?
do they change the signal code somehow so your phone knows?
BT will do the same with ee too in time.
I think I should get out more! Lol
cheers
Tb

[jonsie]

I would envisage a similar scenario here too.