[Q] Cat B15 - No signal in South Korea... - Android Q&A, Help & Troubleshooting

Hi all. This is my first post here, as well as my first Android phone. It is a Caterpillar B15 smartphone.
The problem is, I am in South Korea on a business trip, and the phone will not detect any networks.
I have AT&T service, with international roaming. I have used my SIM card in another phone in South Korea, and the SIM will work here.
I have tried the following things.
As suggested by Catphones.com support, I installed an APN app which installed the APN for the KT Olleh network's data and MMS. This made no difference. I was successfully able to root the phone using instructions here, so that the APN app would work.
The phone is supposed to support the following freqnencies:
HSDPA /WCDMA Dual-Band 900/2100MHz
GSM/GPRS/EDGE Quad-Band 850/900/1800/1900MHz
From what I read, South Korea uses WCDMA 2100 band.
The other info on the phone follows:
Hardware : MT6577
Model : B15
Build number : EMEA_SS.1.020.02
Build date UTC : 20130315-094545
Android v : 4.1.2
Baseband v: [email protected], 2013/03/15 14:35
Kernel v : 3.4.0 ([email protected]) (gcc version 4.6.x-google 20120106 (prerelease) (GCC) ) #1 SMP Fri Mar 15 15:30:45 CST 2013
Uboot build v : -----
LCD Driver IC : 1-hx8369_dsi_6575
I have found several other posts about phones not working in South Korea, and nobody seems to have a firm answer.
The phone DOES work in USA without problems.
Thank you very much for any info!
Sincerely,
David

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Good day, still hopeful someone has had this problem and overcome it. I am going to return to Korea in a few days.
Sincerely,
David
turbokinetic said:
Hi all. This is my first post here, as well as my first Android phone. It is a Caterpillar B15 smartphone.
The problem is, I am in South Korea on a business trip, and the phone will not detect any networks.
I have AT&T service, with international roaming. I have used my SIM card in another phone in South Korea, and the SIM will work here.
I have tried the following things.
As suggested by Catphones.com support, I installed an APN app which installed the APN for the KT Olleh network's data and MMS. This made no difference. I was successfully able to root the phone using instructions here, so that the APN app would work.
The phone is supposed to support the following freqnencies:
HSDPA /WCDMA Dual-Band 900/2100MHz
GSM/GPRS/EDGE Quad-Band 850/900/1800/1900MHz
From what I read, South Korea uses WCDMA 2100 band.
The other info on the phone follows:
Hardware : MT6577
Model : B15
Build number : EMEA_SS.1.020.02
Build date UTC : 20130315-094545
Android v : 4.1.2
Baseband v: [email protected], 2013/03/15 14:35
Kernel v : 3.4.0 ([email protected]) (gcc version 4.6.x-google 20120106 (prerelease) (GCC) ) #1 SMP Fri Mar 15 15:30:45 CST 2013
Uboot build v : -----
LCD Driver IC : 1-hx8369_dsi_6575
I have found several other posts about phones not working in South Korea, and nobody seems to have a firm answer.
The phone DOES work in USA without problems.
Thank you very much for any info!
Sincerely,
David
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