Help Radio bands supported on International model (US)

[bruce73]

I'm trying to ascertain exactly which bands my factory unlocked M8 supports, specifically with AT&T, in order to figure out why my LTE speeds are so low.

Here are the original specs (it's s/off & SuperCID now):

product: m8_ul_ca
platform: hTCBmsm8974
modelid: 0P6B12000
cidnum: BS_US001

I can connect no problem to AT&T's LTE network, usually on Band 4, sometimes on Band 17, but I can't achieve anything higher than 5Mb down/up. If I switch the SIM to my Nexus 4 (modded for 4G), I'll easily get 15+Mb down in the same location.

I've tried other radios from current & past firmwares (WWE, Dev, AT&T), but the speed remains the same. I don't know if this is a software or hardware limitation with this particular phone, or simply a matter of a congested network (I'm in Los Angeles). I'm hoping someone can shed some light on this.

 

[dontpanicbobby]

Networks

2G/2.5G - GSM/GPRS/EDGE:
850/900/1800/1900 MHz
3G - WCDMA:
EMEA: 850/900/1900/2100 MHz with HSPA+ up to 42 Mbps
Asia: 850/900/1900/2100 MHz with HSPA+ up to 42 Mbps
AT&T: 850/1900/2100 MHz with HSPA+ up to 21 Mbps
Sprint: 850/1900/2100 MHz with HSPA up to 14.4 Mbps
Verizon: 850/900/1900/2100 MHz with HSPA+ up to 14.4 Mbps
TMUS: 850/AWS/1900/2100 MHz with HSPA+ up to 42 Mbps
CDMA:
Sprint: 800/1900
Verizon: 800/1900
4G - LTE:
EMEA: 800/900/1800/2600 MHz
Asia: 700/900/1800/2100/2600 MHz
AT&T: 700/850/AWS/1800/1900/2600 MHz
Sprint: FDD 800/1900 MHz , TDD 2600 MHz
Verizon: 700/AWS/1800/2600 MHz
TMUS: 700/AWS MHz

I found these radio band numbers over at HTC US. I hope they help.