Thanks for this, im using just my phone for now, i thought of getting a router when i placed my order for the sim but decided against it. Those Huawei routers are really expensive though man.What modem do you use? I know someone who had the same issue with those portable WiFi routers, he got a proper Huawei B618 and it connected with two bars signal, it's not great but he still manages to pull between 10-20Mbps on a good day, but never less than 5Mbps.
Try picking one up on Gumtree and see if it works, if you have the money.