Originally Posted by mogzyboy:
“I must admit I would've been baffled if the iPhone '5' didn't support all forms of LTE.”
Depends what you mean by 'all'.
It likely won't even support all 3G bands, Apple have repeatedly ignored the 1700/2100MHz AWS band that T-Mobile US use for 3G.
That and there are
43 officially-defined frequency bands that LTE could be deployed on - you can be pretty certain no phone will ever support all of them
Originally Posted by WelshBluebird:
“I'd assume that is a decision networks can make then? (as in LTE is capable of voice calls). Otherwise when the 800Mhz spectrum eventually gets sold off and used you could have a stupid situation where someone gets LTE signal so can use data but doesn't get 3G or 2G signal so cannot make calls!”
LTE is is inherently just a data connection but networks round the world have started work on adopting and implementing VoLTE - a VoIP-like way of carrying calls on LTE networks.
In the long run, VoLTE seems to be the way all networks will end up going but for ease and speed of implementation, using legacy networks as fallback is pretty common.
I believe the way it works is that when you're making or receiving a call the handset will temporarily disconnect from the LTE network.
It would be possible to connect to LTE and legacy networks simultaneously without any special equipment but the strain on a handset's battery would be prohibitive so most handsets tend to switch specifically for calls.