We have been using our MR505 with a Lyca mobile data SIM for several months without issue. As of about 3 days ago, we no longer have internet access. We can connect to the WiFi network, but there is no internet connection.

I have tried the SIM in a mobile phone and it works. I have tried a different SIM in the MR505, and that works too. But put the Lyca SIM in the MR505 and we have problems.

To further confuse the matter, whilst none of our mobile devices nor the TV will connect to the internet, I fired up my ancient laptop and that DOES connect to the internet via the WiFi network (no cable).

I have tried all of the obvious things - factory reset on the router, wiping all of the WiFi networks from my phone and reconnecting, turning everything on and off multiple times.

The APN settings are apparently (?) correct: 

PDP Type: IPv4 & IPv6

APN Type: Static

APN: data[DOT]lycamobile[DOT]co[DOT]uk (forum seems to think this is an external link!)

Username: lmuk

Password: plus

Authentication Type: CHAP

I don't know what else to try... Any suggestions?