Looking for a router that works in an area where 3G has been dropped.

Has anyone, in an area where 3G has been dropped, have a Router that works with SMARTY (and has a telephone socket/port)? If so what make and model is it? Thanks.

I have a Huawei B311 and a Tenda N300.

The Huawei doesn't give me phone calls (it used to before 3G was dropped) but it does receive OTPs correctly.

The Tenda gives me phone calls but OTPs arrive as garbage (so I can't log into SMARTY using it. I have to use the Huawei!)

Any suggestions much appreciated. tia