Contributor
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3 Messages
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:
https://forums.att.com/t5/Network-Coverage/What-is-AT-amp-T-s-GSM-HSDPA-LTE-bands/td-p/4228054#M59606
Two examples I am looking at I believe might support 3g but not 4g/LTE are below if somone can confirm?
xt1621:
HSDPA 850/900/1900/2100 LTE de banda LTE Cat4 – 700/850/1800/2600 (bandas 3,5,7,28)
xt1641(?):
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.
formerlyknownas
ACE - Sage
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118.4K Messages
7 years ago
It looks like the NON- US version will provide 3G, but your chances of getting LTE are a slim to none.
You really don't want the euro version in the USA.
You don't want the 1621. You want the 1625, which is for US carriers.
The dual sim phone has one sim which is 2G only.
You don't want 1641. You want the 1644 model, which for the US.
1621 and 1644 will work perfectly well on ANY US carrier, including Verizon. And has all the LTE bands needed to work on AT&T.
The only dual sim I know of that have 3G are windows and not lower priced. (950/950xl)
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mralaska
Contributor
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3 Messages
7 years ago
Thanks for responding. I hope your information is not up to date! I have seen several sources that indicate there are a few phones now available that support simultanious 3g/4g, one is the Motorola G4 family. I set up a chat discussion with Motorola support and they confirmed:
ME: Can you confirm all G4 support simultanious 3g both sims?
CS: Yes Sir, you can have 4G LTE connection for both sims.
The best third party link discussing solutions to this problem is at:
http://whirlpool.net.au/wiki/dual_sim_4g3g_phones
I am seeing an international phone as my only hope. I can live without LTE. I could even live on 2g only! I absolutely need a functional dual-sim phone, though, to avoid making major changes.
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formerlyknownas
ACE - Sage
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118.4K Messages
7 years ago
If Motorola says it has 3 and 4G minimum on each SIM card, that is great and it's new information.
You should know that not having LTE means a lot of buffering.
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mralaska
Contributor
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3 Messages
7 years ago
Thanks again. I would love to find a (affordable) dual-sim phone with dual-sim LTE compatibility but I think/hope I can live with 3g. When the sunset first started I kept my data sim locked on 2g because my phone SIM would only work on 3g/4g for some reason I could not figure out. When my data sim could not connect at all on 2g I researched and found out 2g was getting phased out. At this point I am behind the eight ball with no functioning phone, but if I get one that works at least as well as having my data sim locked onto 2g then I am functional and happy. If the buffering is going to get worse than when I had functional 2g connection, then I do indeed have an issue to work out!
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GLIMMERMAN76
ACE - Expert
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23.9K Messages
7 years ago
@mralaska
here is a nice video on the g4 plus
https://www.youtube.com/watch?v=VwqMSRPZS70
On the LTE front. You need bands 2,4,5,12,17,29,30 to get lte everywhere. I see bands 2,5,12,30 now on my 35 mile drive to work everyday.
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