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4G is LTE it depends on what icon your network is using to indicate this
The other letters are for 2G, 3G and 3G+ these will change depending on signal strenth and area you are in as not all areas will have a 4G/LTE signal
It's firmware related, not network related. For example, on .69 TW I had 4G icon, on .402 DE I have LTE (same network, few minutes apart). It doesn't matter as it's the same thing 4G=LTE, nomatter what US wireless carrier told you. They lied for a long time, pushing H+ (or even 3G+) as 4G.
According to the 3 network it is because of the latest software update from Sony and nothing to do with the network however I think they (3) are telling me a load of rubbish
I've seen that with other carriers, remember that Sony release an update and each carrier has to add their bloatware and customize it, then test it and then release it.
sony xperia z2 LTE NOT WORK