T-Mobile SIM stopped working overseas after Sept 1, 2018 patch - International Version Dual SIM S8

[jersno]

I have an international dual SIM version of the S8 that I use for traveling. I have a US T-Mobile SIM that worked flawlessly overseas up until I installed the September 1, 2018 Security patch around September 14th. I never had any issue connecting to local providers in any country that I visited before this update.

After the patch install, my T-Mobile SIM will no longer connect to any provider overseas. I get no data icon and the phone usually says "Emergency Calls Only".

I have tried resetting my network settings, getting a replacement SIM from T-Mobile, and clearing the cache. I really don't want to do a factory reset if I don't have to.

Anyone else have this issue after that security update? Any ideas on how to fix it?

 

[tube517]

Contact T-mobile

 

[jersno]

Contact T-mobile

I assumed people would be able to put 2 and 2 together and get that I did because I mention getting a new SIM in my first post. Same problem with the new SIM.

T-Mobile doesn't control any international carriers, so there is nothing they can really do about that. It also isn't an T-Mobile branded phone, so no help there either.

My ATT SIM in an iPhone 8 works on all carriers overseas, so I don't think it is a local carrier issue as far as towers being down or anything. Now if overseas carriers have some beef with T-Mobile.. It is possible.

Maybe a coincidence that it stopped working immediately after installing an Android update...? I am doubting that.