why is three going to block older 4G devices

[lukefowler2023]

it seems like three is going to block my older 4G device when 3G is turned off, why would three do this. i expect three to provide me with a new device free of charge if they are going to block my 4G device

[sc1999]

If you get a free phone then everyone will be buying old ones on eBay and asking for an upgrade.

[lukefowler2023]

not been able to call is not a problem for me but there is no reason for 4G data to stop working