Hi Flatman, welcome to the eForum!
The online billing facility through
My Account for a dongle is exactly the same on the surface as it is for a phone. The confusion may come because a dongle has an eleven digit "mobile number" just like you get with a phone - this can be seen on the VMC desktop when using the dongle.
If the online registration is for a PAYG dongle, then the best way to tell, once you've logged on, is to check just below the number in the top left of the main section of the page, where you will see the details of your remaining data credit. This will only show with dongles, not phones.
Once logged on, the left hand column of options is where you'll find the top up options, however there are also other ways you can top up - check
here for the details. The difference between a dongle and a phone is just that you need to top up £15 at a time for the dongles.
If you're still unsure if the online registration was set up properly, let us know and we'll send an email out. We'd need to speak to whoever the dongle is registered to to check it, but we'kll be happy to have a look.
DaveN
eForum Team