Answers
How Does Mobile Number Portability Work for an MVNO?
Number portability lets a subscriber keep their phone number when they switch provider. In the US, the new provider requests the port, the old provider validates the request against the customer's account details, and the national Number Portability Administration Center (NPAC) database is updated so calls and texts route to the new network. Wireless-to-wireless ports usually complete within hours when the details match. Most failures come from mismatched account information, not from the network.
For an MVNO, the practical point is that the port usually runs through the host network or MVNE's porting systems. The MVNO controls the front end: collecting the right details, checking them before submission, and keeping the customer informed.
This page describes the US process. Other countries use different systems and rules.
The port-in process, step by step
Timing depends on the port type. FCC rules require simple wireline and simple intermodal ports (for example, landline to mobile) to complete within one business day. Wireless-to-wireless ports follow industry processes and typically complete much faster when the request is clean.
- Customer requests a port. The customer signs up with the new provider and asks to bring their number.
- Details collected. The new provider takes the number, the account number with the old provider, a port-out PIN or passcode, and usually the account holder's name and billing ZIP code.
- Port request sent. The new provider submits a wireless port request to the old provider.
- Validation. The old provider checks the details against the account and either confirms or rejects the request with a reason.
- NPAC update. On confirmation, the new provider creates the port in the NPAC, which updates the routing information for the number.
- Activation. The number goes live on the new provider's network, and the old provider releases it and closes that line.
Why port-ins fail
Every rejection delays activation and often loses the customer. The cheapest improvement most MVNOs can make is validation before submission, so obviously incomplete or inconsistent requests never leave the sign-up flow.
| Rejection reason | What usually happened | How to prevent it |
|---|---|---|
| Account number mismatch | Customer gave a billing number, not the account number, or the old provider uses a different identifier | Tell customers exactly where to find it for each major provider |
| PIN or passcode mismatch | Customer did not generate the port-out PIN, or it expired | Prompt customers to request the PIN before submitting |
| Name or ZIP mismatch | Business account, account in a family member's name, or old address | Ask for the account holder's name as it appears on the bill |
| Number locked | Customer has an account or port-out lock in place | Tell customers to remove the lock first |
| Wrong provider | Number is served by an MVNO or reseller on another network, not the network the customer named | Look up the current provider before submitting |
| Multi-line account | Porting one line from a shared plan needs additional handling | Flag multi-line accounts at sign-up |
Port-out fraud rules
Port-out fraud is when someone fraudulently moves a victim's number to a device they control, usually to intercept security codes. In 2023 the FCC adopted rules requiring wireless providers, including resellers, to use secure methods to authenticate customers before a port-out, notify customers immediately of port-out requests, and offer customers a free option to lock their account against ports.
Compliance with some of these provisions was tied to federal paperwork approval, which delayed their effective dates. Check the current status before relying on any specific deadline, but design for the rules now. They shape how an MVNO issues port-out PINs, how it authenticates customers in support channels, and what notifications its systems send.
What an MVNO controls and what it does not
Most MVNOs do not connect to the NPAC directly. The host network or MVNE executes ports and holds the number inventory. The MVNO controls:
- Data capture. The sign-up flow that collects port details.
- Pre-submission checks. Format checks, provider lookup, and prompting for the PIN.
- Customer communication. Status updates while the port is pending and clear instructions when it is rejected.
- Port-out handling. How customers get their own account number and port-out PIN, and how requests are authenticated.
- Exception handling. How quickly rejected ports are corrected and resubmitted.
Port-in rate is an acquisition metric
Port-in rate is a direct acquisition metric. A customer who cannot bring their number often does not complete sign-up at all.
These steps live in the MVNO's subscriber operations and provisioning systems. See the TelcoEdge MVNO platform for how those operations are handled on one platform.
Related Pages
FAQs
Can a customer port a number that is still under contract?
Yes. Porting cannot be blocked because of an unpaid balance or contract term. The customer may still owe the old provider early termination fees or device payments.
Does porting cancel the old service?
Yes. Once the port completes, the old provider releases the number and the line on that account ends. Customers should not cancel the old service first, because the number can be lost.
Can an MVNO port numbers in from another MVNO on the same host network?
Yes. The process is the same. The request goes to whichever provider currently serves the number, which may be the other MVNO or its enabler rather than the host network.