How did you set Data Roaming to On please? I have the sim in the router but can’t get the internet connection. ( I don’t have a phone that takes the micro sim)Lyca Sim arrived and works perfectly fine in my Archer MR600 Router (you need to set data roaming to on though). In the day time I get around 20-25mbps but in the evening it reaches 60mbps even with 2 bars signal so can't complain. Best spot I've found is upstairs near the window which has 2 bars solid and 3 if I open the window and stick my arm out holding the router pointing it upwards and to the left towards the mast (might get an antenna in a few months if this still works and have 3 bars constantly).
For £12.50/month for 6 months it's a really good price, I'll see how this goes and keep everyone updated if anything changes.