AT&T frequency band compatibility for dummies?
I found the chart posted for AT&T compatiblity but I have not found an explanation on how to interpret the chart. I need to determine which bands are actually required and how many of them.
The chart and comments elsewhere seem to indicate band 17 can stand alone but if not available 2 & 5 (or 2 & 4?) can work together to support LTE and those are the minimum requirements for LTE, is that accurate?
If a phone lists HSDPA 3g 850 & 1900 is it safe to assume it has 3g connection capability or are there band number considerations to accompany those frequencies also? (I have not seen 3g phone specs list the bands such as II & V on the AT&T chart, but they do mention HSDPA a lot? What should I be looking out for?)
This is the post I found the chart:
Two examples I am looking at I believe might support 3g but not 4g/LTE are below if somone can confirm?
HSDPA 850/900/1900/2100 LTE de banda LTE Cat4 – 700/850/1800/2600 (bandas 3,5,7,28)
3G bands HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
LTE band 1(2100), 3(1800), 5(850), 8(900), 40(2300)
Thanks for any assistance helping me sort this all out! I am desparate for a new phone because the sunset of 2g crippled my current dual-sim phone and dual-sim is not generally available in the USA, especially an affordable decent model that allows simultaneous 3g/4g monitoring. I can live without LTE but my current phone is crippled with one SIM forced onto 2g as soon as the other is active.