See if this post helps at all.
https://community.48.ie/t5/Internet/How-to-fix-no-network-service-when-roaming/m-p/56518
If not then you'll probably have to contact 48 support.
Hope this helps.
Glad you got it sorted.
The credit for the info really belongs to @CormacL599
While you're here, check out our "Featured Topics" below.
Our Troubleshooting Guide and Knowledgebase contain help and support articles and popular questions to help you as a 48 customer.