familymobile voicemail not working on iphone

hi just ported my phone number over to ikea family mobile network , but for some reason or another i cant get my voicemail to work on my iphone 2g ? has anyone else experienced the same problem or any similar problems using their iphones with family mobile network ?>??

just spent 2 hours on the phone talkin to family mobiles tech support but to no avail ... they cut me off in the end :(