While working on a contact list cleanup for a regional campaign, I ran into a bunch of invalid numbers that kept disrupting the process. I started using a lookup tool to verify line status and location, which helped a lot, but there were still a few entries tied to UK carriers that wouldn’t process properly. To dig deeper, I reached out to
lebara mobile uk customer support for clarification on prefix usage and number recycling policies. Their input helped resolve the last of the errors, and now my outreach system runs without a hitch.