The first thing to do is make sure you have the correct message centre number @Rachel22 , this should be +447785016005 . Depending on the phone you have there is further information from device guides here: Device Guides Completing a manual roam will refresh the network settings and update the SIM on the network here: How do I perform a manual roam?
According to this link Vodafone would send a text notification to let you know the number was fully ported but if there are any further problems, the Social Team are online to help and they can be contacted by following this link: Contact Us
