It may be the case that some or all 3G sim cards...
Why would mobile networks want the extra cost of producing additional SIM cards to give to 4G customers if the 3G Cards will work perfectly well? The networks are not likely to charge customers for the new 4G SIMs, so would be taking the cost on themselves (granted, I dont expect the manufacturing cost to be anything significant for a single SIM).
It's the network that requires the new sims. Some sims cannot be updated with certain cell info that is required for them to allow the phone to 'see' the network and be provisioned on the system..
HOWEVER it is good practice just to replace the sims as you never know how old or crappy the state of the sim over several upgrades some may have.
It is also good marketing, it makes the 4G feel even more special and new to customers... silly but crap like that works.
Are you sure? They never used to, and I would have thought it'd be pointless to try now considering the near lack of 2G roaming these days.
In cases where they did (I remember reading about a dodgy batch of SIMs), 3 detected it pretty quickly and sent out a new SIM that wouldn't work with a letter telling you to stop doing it.
Are you sure? They never used to, and I would have thought it'd be pointless to try now considering the near lack of 2G roaming these days.
In cases where they did (I remember reading about a dodgy batch of SIMs), 3 detected it pretty quickly and sent out a new SIM that wouldn't work with a letter telling you to stop doing it.
I'm sure they did. I remember being able to pick up 2G signal in a 2G phone in N Ireland a couple of years back.
But i could be wrong. I don't know enough or have enough evidence to fully back up my claim.
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I think they key part in your quote is
Why would mobile networks want the extra cost of producing additional SIM cards to give to 4G customers if the 3G Cards will work perfectly well? The networks are not likely to charge customers for the new 4G SIMs, so would be taking the cost on themselves (granted, I dont expect the manufacturing cost to be anything significant for a single SIM).
Can I ask why that is?
Because all 3G sims work in 2G phones.
Even Three UK sim cards.
HOWEVER it is good practice just to replace the sims as you never know how old or crappy the state of the sim over several upgrades some may have.
It is also good marketing, it makes the 4G feel even more special and new to customers... silly but crap like that works.
Are you sure? They never used to, and I would have thought it'd be pointless to try now considering the near lack of 2G roaming these days.
In cases where they did (I remember reading about a dodgy batch of SIMs), 3 detected it pretty quickly and sent out a new SIM that wouldn't work with a letter telling you to stop doing it.
I'm sure they did. I remember being able to pick up 2G signal in a 2G phone in N Ireland a couple of years back.
But i could be wrong. I don't know enough or have enough evidence to fully back up my claim.
Perhaps they've finally stopped caring now that 2G roaming isn't nationwide like it was in the good old days.
I have a modern Three SIM but I have no idea where any of my 2G phones are (the ones that outright rejected a 3 SIM) to test.
Not for me they don't. Is that an old Sim?