What 3G modem to take for ASUS RT-N66U?

Question

ASUS

Dear community, please share your experience.
There is a router, there is a need to use it not only where there is Internet via ethernet, but also in "field" conditions (dacha, abroad, etc.).
Thus, there is a desire to have such a set, in which it is enough to insert a SIM card of a local operator into the modem, and then use this Internet via wifi.
If you advise a broken "whistle" from operators, but which can be unlocked (for a fee or for free - it doesn't matter), it will also work.
Task: you need a 3G modem that with any SIM card (Russia, Southeast Asia, etc.) will work with this router.
The firmware on the router is stock.
Thanks in advance!

Answer 1

When I had a 3G modem (Huawei E1150), it was enough to configure the connection settings and it supported all operators.

Answer 2

Thank you friends :)