19-08-2018 01:44 PM
My mobile roams globally, usually without difficulty. But I cannot make/receive calls or texts in South Korea. Exactly the same thing happened last year. Why?
Solved! See the answer below or view the solution in context.
21-08-2018 12:43 PM
19-08-2018 01:49 PM - edited 19-08-2018 01:52 PM
It's probably because the vast majority of South Korea mobile networks are CDMA instead of GSM and GSM handsets (which we use) wont work on CDMA mobile networks.
4G *may* work for data but it's unlikely to work with voice as you can't use VoLTE whilst roaming.
Try turning 4G off to see if 3G still works as apparently there is some 2100Mhz 3G there which is the same frequency we use here.
20-08-2018 12:30 AM
Thank you. I've switched off 4G but the phone is still not connected. Any other suggestions please?
And how can we identify this problem before we travel? I use the phone for two-factor authentication to access my email account, and I am locked out of that as well.
20-08-2018 08:04 AM - edited 20-08-2018 08:06 AM
Welcome to the community, I hope you're having a brilliant time in South Korea.
Could you try manually selecting a different available network (keeping 4G off):
Let me know what happens.
|Apple||Settings > Carrier > Toggle Automatic OFF|
|Android||Settings > More Networks > Mobile Networks > Network Operators > Tap OK|
|Windows||Settings > Mobile Network > Network Selection > Tap on start manual search|
20-08-2018 10:33 PM
When I tap "network operators" I get two options: Search networks and Search authomatically, but when I tap either I jyst get a blue spinning circle.
Occasionally the words "SKTelecom" a local provider appear top left on the home screen but even when they do I have no connection.
21-08-2018 08:04 AM
How long are you waiting for the available networks to appear? It can take a few minutes to search for them.
Is there anyone with you who is using a UK mobile?
Hope to hear back form you soon.
21-08-2018 11:48 AM
Thank you. I do now have a connection, via SKTelecom. It's intermittent. The trick seems to be to switch from GSM to WCDMA then wait a few minutes.
21-08-2018 12:43 PM
by Paulramsey68 a week ago