Purchased a pay as you go sim for a router - how to initiate it?

[XRaySpeX]

If it's already topped up just use in the router.

[Lockleydale]

Tried that already, it is a brand new sim and shows no internet connection, someone has said that it needs to go in a phone first to get an activation code sent.?.

[XRaySpeX]

All the PAYG SIMs I've put in mobile routers have worked straight away. I've never bothered to register them to MyEE to receive an activation code..

Visit http://add-on.ee.co.uk/status from a device connected to your mobile router by WiFi to see your data & credit status as well as its mobile no. at the top. What does it say,  obscuring your mobile no.?