Was away for the weekend and tried to use my mobile wifi model as per title and even though I typed in the wifi key code for the unit it kept coming up with message -

USER Name - ADMIN in first box then asking for password in next box .

Now I cant recall ever putting in a user name or password so could this be for the
network I am trying to connect through ?
I have new sim cards with mobile credit here but if I try using a new sim card I start
losing credit time as they are pay as you go cards so don't want to use one whilst home but then again don't want to be away and not able to get online when needed ?