It won't let me top up

[jonnytass]

It says check my card details why is this help

[Anon]

are you sure you're selecting the right card? visa/mastercard etc?

try using a different browser/clearing your current browsers cookies and/or cache.

[dalyer]

Check or reenter your card details.

If they are correct but still don't work then contact 48 support for advice:

http://www.48months.ie/help#ask-a-48-agent

Hope this helps.