Cell stuff is still messy. They still make a lot of equipment that will not run on all providers. You need to match the LTE bands used by your provider to the router. The alcatel uses 2,4,12 which is common for most cell in the USA..except sprint. Form what I can tell the mr200 uses 1,3,7,8 and a few more. There might be different hardware versions of this router but from what I can tell that router is mainly designed to run in Europe or India. You need to see if the router has a menu or the documentation tells you which bands it supports.
If it is dropping back to GSM or if it connecting to a tower farther away that does support one of the bands the router supports you will get much slower speeds.