Text Messaging/SMS for LG V410 (LTE)?

[darkgiant]

I have an LG V410 (LTE, AT&T Version), I have a T-Mobile tablet data plan on it, and part of the plan allows the ability to read and send text messages (SMS). Though for some reason, after enabling the T-Mobile APN, I now have LTE and internet access, but I can't read or send text messages.

For example, when someone sends me a text message through the tablets phone number, I'll see it for a few seconds in the Messaging app, and then it disappears. When I try to send an SMS it says in a blue box "SMS disabled" and I have no idea how to enable it in the first place.

Can someone help me here? This device is stock, and not rooted.

 

[iceman_oz]

Sorry for my ignorance but I haven't been able to start a new thread yet. I have a AT&T G Pad v410 as well but I can't get the SIM working. It is SIM locked to AT&T. I purchased a unlocked code from eBay but it didn't work either. The guy sold me the code said it might be it's not in the stock rom which cause it. It is actually in CM 12 rom.

Can anyone suggest whether I should flash it back to the stock rom and unlock the SIM? Is there any thread about how to do it?

Much appreciate!