Samsung ativ s t899m roaming problems-how do I fix?

[WPCentral Question]

Hi,
I've bought 2 samsung ativ s t899m (Bell Canada) and took them overseas.
From the start I've encountered a similar problem in both phones: there's a network (carrier) connection problem. Every now and then I'm unable to make an outgoing call and and error message appears (unable to connect to network) but at the same time I have no problem receiving calls, sending and accepting messages (SMS & MMS) and using data.
I've tried changing carriers but the problem consists.
When I reboot the phone I can again make outgoing calls.
Carriers technical divisions claim there's a problem with the phones (maybe API software issue) but can't be sure because it not there phone.
Another Tech guy told me it's a roaming problem but had no idea on how to fix it.
Any ideas?
Thanks!

 

[Laura Knotek]

Are these devices unlocked?

What carrier's SIMs are you using overseas, and in what country or countries?

 

[JamesPTao]

Don't know if this will work or pertains but there an option I the phone settings to prevent roaming. By default it prevents it.

 

[ronku]

Devices are factory unlocked. Roaming is enabled.
I'm now in Israel and the problem consists with both phones on 2 carriers - both are fully adequate with phone bands.
I'm using a local carrier micro-sim.
OS ver.: 8.0.10521.155
Firmware ver.: 2212.13.11.2
Bootloader ver.: 1308.14.16
SOC ver.: 1.5.32

Samsung Canada suggested a hard reset but said there's no way knowing if it'll solve the problem (seems like a s.o.p for them...)

 

[ronku]

Hi,
I'd really appreciate the help....
Thanks