T-Mobile Galaxy S3 / AIS 3G problem

[Dork]

I have a friend that has just moved to BKK from the US. He brought his T-Mobile Galaxy S3 with him and bought a One2Call SIM card and a 3G package. However the phone only shows the "E" icon for Edge and won't make a 3G connection. He has spoken with the AIS helpdesk who have tried to help but so far no success.

I have a Lumia 920 on AIS postpaid. When I put the One2Call SIM in the lumia 3G works fine. Also when I put the AIS SIM into the Galaxy 3G (H or H+) also work fine (strangely the Galaxy shows a 4G icon) and speedtest results are fine.

The only combination where 3G won't work is the One2Call SIM in the Galaxy. I guess the APN etc. must be set correctly because 3G works with the AIS postpaid.

Any suggestions would be welcome.

Cheers

[lomatopo]

Assuming the model no; is SGH-T999, and that it is unlocked, it seems like it should work on AIS/One-2-Call's3G/2100 MHz network, provided there is coverage and the unit is properly configured. Maybe manually configure the APN, add value and subscribe to a 3G plan.

http://www.thaivisa.com/forum/topic/649816-a-i-s-one-2-call-3g-pre-paid-sim-on-2100-mhz-3g-a-review/

It would also work with CAT/TrueMove/850 MHz, TrueMove H (2100 MHz) and DTAC/Happy (850/2100 MHz). It will not work with AIS's 900 MHz/3G network.

[Dork]

Assuming the model no; is SGH-T999, and that it is unlocked, it seems like it should work on AIS/One-2-Call's3G/2100 MHz network, provided there is coverage and the unit is properly configured. Maybe manually configure the APN, add value and subscribe to a 3G plan.

http://www.thaivisa.com/forum/topic/649816-a-i-s-one-2-call-3g-pre-paid-sim-on-2100-mhz-3g-a-review/

It would also work with CAT/TrueMove/850 MHz, TrueMove H (2100 MHz) and DTAC/Happy (850/2100 MHz). It will not work with AIS's 900 MHz/3G network.

Aha thanks. From your last sentence I realised that SIM card was still on the 900MHz network. I had assumed that because it was purchased recently it would already be on the 2100MHz network but apparently that was wrong.

Anyway, I upgraded it to 2100MHz and it's working perfectly so thanks again.

Strange that the phone shows that it is connected to 4G. Doesn't matter though.

[lomatopo]

Strange that the phone shows that it is connected to 4G.

I suspect this is merely an anomaly of this model/firmware/baseband? Since it is on 3G (here in Thailand) and/or 2100 MHz it assumes it is on T-Mo's "4G" network, even though that runs on AWS (1700 x 2100), or re-farmed 1900 MHz..

AIS Freedom 2100 MHz SIMs are labeled as such, and relatively ubiquitous in the retails channels now.