There was a time when porting numbers between providers meant weeks of paperwork, mid-port routing gaps, and the very real possibility that a major customer-facing line would go dark for an afternoon. It doesn't have to be that way anymore. With the right preparation, a port should be something your team forgets even happened by the next morning. Here's how we run them in 2026.
Step 1: Audit What You're Actually Moving
Most port problems start before any paperwork is filed, with an inaccurate inventory. Pull a clean list of every number, country, current carrier, account number, and current routing destination. Flag the numbers that are actually critical (mainline, support, billing) versus the ones that are dormant or expired. You'd be surprised how often a "must-port" list shrinks by 30% once it's actually reviewed.
Step 2: Get the Letter of Authorisation Right the First Time
More than half of port rejections we see come down to LOA mismatches: account number off by a digit, billing address that's been updated but not at the losing carrier, business name slightly different from what's on file. Before you submit anything, validate the LOA against the most recent invoice from the losing carrier, not the one you have on file but the actual most recent one. Five minutes of double-checking saves a week of resubmissions.
Step 3: Plan the Cutover Window
Pick a low-traffic window. Confirm both sides have agreed to the same exact timestamp. Have your routing already configured on the receiving side so traffic flows the moment the port completes. Have a rollback plan even if you're 99% sure you won't need it. And keep the losing carrier's support number visible. Sometimes the quickest fix to a stuck port is a polite phone call to the right desk.
What Goes Wrong (and How We Catch It)
The three most common failure modes: LOA reject loops, where small typos send you back to square one; mid-port routing gaps where neither carrier owns the number for a few minutes; and misaligned billing dates that lead to a month of double-billing nobody notices. We've automated checks for all three, and our porting team chases the carrier on your behalf rather than waiting for an email reply.
The result is the kind of port nobody talks about afterwards, because there's nothing to talk about.
A good port is one your team forgets happened by the next morning.