Lg gpad v520 - LG G Pad X 8.0 Questions & Answers

Contemplating buying either an unlocked ATT model or TMO model.
If I use my current TMO voice and data sim card in the T Mobile version of this tablet will they block data access and force me to buy a tablet plan?
I think my TMO voice and data sim will work on the unlocked ATT model but I'd lose text message function and other things ?

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Hi,
I know this is old, but for anyone else who's looking...
I have T-Mobile, and have both the V521 (T-Mobile) and V520 (AT&T) tablets.
The V521 (T-Mobile) has:
Gold case, white screen bezel
Ability to send & receive texts
Ability to use tablet as hotspot
Microsoft Office Word & Excel
Android™ 6.0.1 Marshmallow. Can upgrade Android to Version 7.0
Rear-facing camera 5MP, 2560 x 1920
Bluetooth® Wireless Technology Version 4.2 LE
LTE Bands 2/3/4/7/12
Battery Capacity 4,650 mAh
Internal Memory 16 GB (up to 9.18 GB usable)
Wi-Fi® Connectivity 802.11 a/b/g/n/ac
Wi-Fi Direct® File Sharing
The V520 (AT&T) has:
Dark blue case, black screen bezel
Cannot send & receive texts
Cannot use tablet as hotspot
"Think Free Office" version 4.70 by Hancom, instead of Microsoft Office. (Think Free is an old version, can't upgrade it.)
Android™ 6.0.1 Marshmallow. Can only upgrade Android to Version 7.0 if using an AT&T SIM card
Rear-facing camera 8MP, 3264 x 2448
Bluetooth® Wireless Technology Version 4.2
LTE Bands 1/2/3/4/5/7/12/29/30
Battery Capacity 4,800 mAh
Internal Memory 32 GB (up to 22.1 GB usable)
Wi-Fi® Connectivity 802.11 a/b/g/n/ac/i/r
Video Screenshot (Capture still shots from a video during playback)
When used as an eReader or wifi tablet, other than Office, I don't notice any difference. I don't use the camera much, and I have a microSD memory card installed, so the memory difference doesn't affect me.
I don't have a newer wifi router, so the extra bands on AT&T don't give me anything extra, nor do the extra LTE bands.
Having only Android™ 6.0.1 Marshmallow does give me a problem sometimes, when adding or upgrading apps that require 7.0.
When using on LTE, using the T-Mobile is far better. I use texting all the time, and the AT&T doesn't allow for texting. My T-Mobile plan gives me plenty of data, so I do use the hotspot, and not having it on the AT&T is annoying.
Overall, despite the extra memory and better camera, I prefer the T-Mobile V521 far more than the AT&T V520.