There is no compatibility list for TL-WR902AC V1 since this product is not aimed to be used as 3G/4G router and that feature is not promoted also.
If you want to get internet from SIM card and use wifi, I would recommend Mifi products which saves you a lot of trouble. You just need to plug in the SIM card and use wifi, instead of checking the compatibility issues around.

Hello,

Thanks for your reply.

In fact, this is not what is promoted on TP-Link side:
http://uk.tp-link.com/products/details/cat-9_TL-WR902AC.html

Quotes:
Versatile USB – For file sharing or internet access from a 3G/4G USB modem
Travel-Sized Design – Conveniently small and light to pack and take on the road, creating Wi-Fi network via Ethernet, 3G/4G USB modem or WISP

So, I assume I would be able to connect a 3G/4G modem on that TP Link router and would be able to share 3G/4G connection among different equipment's.

What is not clear and not sure if some Admin or TP-Link representatives can confirm, if ZTE MD831 is compatible with TL-WR902AC.

Can TP-Link confirm?

Thanks in advance.
Luis Santos

Sorry that we don't have the compatibility list for TL-WR902AC, thus we cannot tell whether your modem is compatible or not. If you want a device to use with SIM card, we would recommend the TL-MR200 and TL-MR6400 in this link: http://www.tp-link.pt/products/list-4691.html
With MR200 and MR6400, you can plug in a SIM card with compatible format and get internet from them.
For the TL-MR3020 and TL-MR3420, your modem are not in the compatibility list, which means we also cannot make sure whether it is compatible or not.