Why can't I change my network mode?

[merrrx]

I'm using a Samsung Galaxy S6 Duos with Android 6.0.1 installed.

My SIM1 has a local Philippine Sim Card installed. On SIM2 I have a t-mobile on it.

I'm in the USA trying to use my T-Mobile sim for data but the network mode can't be selected and is stuck on 2G. Sim1 can be changed, though.

Please help. I know it isn't the sim card because I went to t-mobile and they tried it on a different phone and it worked fine.

I can also make calls and send text messages so I know network has nothing to do with it.

It worked fine before, as well. Only had this problem now after removing the sim card and installing it back on.

Also I can't even change or add APNS. Says it's restricted for the current user profile.

 

[hylex]

Second sim on s6 duos is 2G only. Swap the sims around and it will work fine

 

[merrrx]

I used to use it as it is with 4G. It just did this when I removed the Sim a few days ago.

 

[merrrx]

Second sim on s6 duos is 2G only. Swap the sims around and it will work fine

I used to use it as it is with 4G. It just did this when I removed the Sim a few days ago.

 

[lucianus_luciferus]

have you tried what hylex said?

 

[merrrx]

Yes. Sim 2 still can't be changed. Like I said, it's not possible that sim 2 is only for 2g because I was just using it for 4g a few days ako