[heskethbang]

Quote:

Originally Posted by Redcoat

It may be the case that some or all 3G sim cards cannot handle the more recent security features implemented for 4G networks hence a 4G sim being required. In the early years of 3G coverage some networks turned off some security features on their 3G networks & sims to the point of being 2G backward compatible, so that if a customer was given a 3G enabled sim it would still work with many older 2G only phones. 3 was one that for obvious reasons didn't do this, hence their sim cards won't work on many antique 2G phones.

If you look on other providers sites, such as Optus in Australia, they don't require customers to change sim cards to go from 3G to 4G.

[jabbamk1]

Quote:

Originally Posted by Redcoat

It may be the case that some or all 3G sim cards cannot handle the more recent security features implemented for 4G networks hence a 4G sim being required. In the early years of 3G coverage some networks turned off some security features on their 3G networks & sims to the point of being 2G backward compatible, so that if a customer was given a 3G enabled sim it would still work with many older 2G only phones. 3 was one that for obvious reasons didn't do this, hence their sim cards won't work on many antique 2G phones.

That doesn't apply here

[RileyM]

Quote:

Originally Posted by heskethbang

If you look on other providers sites, such as Optus in Australia, they don't require customers to change sim cards to go from 3G to 4G.

I think they key part in your quote is

Quote:

Originally Posted by Redcoat

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).

Quote:

Originally Posted by jabbamk1

That doesn't apply here

Can I ask why that is?

[jabbamk1]

Quote:

Originally Posted by RileyM

Can I ask why that is?

Because all 3G sims work in 2G phones.

Even Three UK sim cards.

[The Lord Lucan]

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.

[moox]

Quote:

Originally Posted by jabbamk1

Even Three UK sim cards.

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.

[jabbamk1]

Quote:

Originally Posted by moox

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.

[Zee_Bukhari]

the last time I checked my three sim card worked in a 2G only phone

[The Lord Lucan]

Three sims work in 2G phones, just checked.

[moox]

Quote:

Originally Posted by The Lord Lucan

Three sims work in 2G phones, just checked.

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.

[alanwarwic]

Quote:

Originally Posted by The Lord Lucan

Three sims work in 2G phones, just checked.

Not for me they don't. Is that an old Sim?

[The Lord Lucan]

2 month old retail bought PAYG sim. Does your location have 'Three' 2G?

[Redcoat]

The 3 PAYG sim I have doesn't work on a Nokia 3410, Nokia 3510i or Sagem my-X6. It does however work OK on a Nokia 6230i (all phones mentioned 2G only).

[beecart]

Anyone know when O2 are going to roll out 4G in more places and where these places will be?