I've got this MOFI pocket wifi using Huawei EM770 with the following  specification:
manufacturer:Huaweimodel:EM770interface:MiniPCIechipset:Qualcomm MSM6290GSM frequency bands:850, 900, 1800, 1900UMTS frequency bands:850, 1900, 2100HSDPA:7,2 MBit/sHSUPA:5,76 MBit/sEDGE:236,8 KBit/sGPRS:57,6 KBit//s
 I believe telecom XT use UMTS 850 and 2100 but I've input the correct APN and I still can't get on to net.

APN: internet.telecom.co.nz
Login and password are blank
PIN is blank

I've tried following things:
-Switching to 2degree SIM= working
-Using XT SIM on my phone(Only support 1700/2100)= working

It's seems to be a setting problem but I don't know which one, if you have setup a pocket wifi before please give me some advise.