On Sun, 14 Jul 2019 15:04:28 +0100, Roland Perry
wrote:

In message , at 14:31:13 on Sun, 14 Jul
2019, tim... remarked:


"Roland Perry" wrote in message
...
In message , at 11:09:30 on Sun, 14 Jul
2019, tim... remarked:

I'm not sure how many phones ever took the full size SIM.

Commercial considerations killed them off: the idea was that a
person would have a SIM, and be able to share/borrow a phone to use


But the networks wanted to tie people into having their own phone
(and contract) in particular not wanting a phone they'd subsidised
being used with a SIM from a rival network,

They solved that problem by having phones "network" locked

My "acquired" smart phone still is

Is still what. Locked? That's hardly unusual.

I know

but you seemed not to understand it as the solution to people "sharing"
phones by swapping SIMs in/out

Do keep up: "[Opportunities open up] Even on a locked phone because
(for example) GiffGaff and Tesco both use O2, and Virgin/Orange/T-Mobile
all share EE."

O2 locking also seems to die eventually by around 18-24 months but it
might depend on whether or not a 'phone was originally purchased
outright.