Are there 4G / 3G WiFi routers in nature without being tied to an operator?

Question

Iron

Location - Moscow.
The "Big Three" operators offer various branded 4G/3G WiFi routers with different curvature radii. Such a router - to want, to become attached to a specific operator - to really not want.
Are there 4G / 3G WiFi routers without being tied to an operator and what kind of routers are they?

Answer 1

https://market.yandex.ru/catalog/55410/list?hid=72...

Answer 2

there is.

Answer 3

I wanted to buy from the Chinese, but even expensive, I ended up buying from us for 2000r. name is Huawei E5373, 4 clients are using it at home with a bang.