Switching carriers doesn't mean abandoning your phone number—number porting lets you keep your existing digits while moving to a new provider. The process is straightforward, but costs, timing, and requirements vary significantly between carriers, so understanding what you're getting into saves frustration and money.
What Is Number Porting and Why You'd Want It
Number porting (also called Local Number Portability or LNP) transfers your phone number from one carrier to another. It's valuable if you're unhappy with your current provider's service, pricing, or coverage, but you've built up equity in your existing number through years of contacts, business listings, or customer relationships.
The Federal Communications Commission (FCC) made number porting a legal requirement in 2003, so any major U.S. carrier—Verizon, AT&T, T-Mobile, or regional operators—must accept your port-in request. That said, the process takes time and often incurs fees.
Direct Carrier Costs
Most major carriers charge $0 to $45 to accept an incoming port. Here's what you'll typically encounter:
- Verizon: Often charges $30–$40 for number porting on postpaid accounts; prepaid ports may differ
- AT&T: Generally $0 for existing customers upgrading lines; $25–$30 for new customers
- T-Mobile: Often waives porting fees for new postpaid customers during promotions; standard fee is $0–$20
- Regional carriers: Fees vary widely ($0–$50); check directly with your target provider
Many carriers actively recruit switchers and periodically eliminate porting fees as part of loyalty incentives. If you're comparing carriers on Mercoly, check their current promotion pages—porting fee waivers are common for new postpay sign-ups.
Hidden Costs and What Triggers Them
Porting itself is free or low-cost, but your old carrier may charge early termination fees (ETF) if you're still under contract. This is the real expense:
- Contract ETFs: $100–$350 per line, depending on how much time remains on your agreement
- Final bill charges: Prorated service, equipment fees, or taxes on your last bill (not strictly a "porting" cost, but it stings)
- Plan changes: Some carriers require you to move to a specific plan tier to port in, which may cost more than your current setup
Your new carrier won't cover these charges, though a few (AT&T, T-Mobile, Verizon on occasion) run "port-in credit" promotions that reimburse ETFs up to $650 if you switch with an eligible phone purchase.
Timeline and Preparation
Number porting typically completes in 1–5 business days, though some regional carriers take longer. During this window, your old service remains active until the port completes.
Steps to port your number:
- Check your current account for any outstanding balance or contract terms; pay ETFs upfront or confirm a credit will apply
- Obtain your Account Number, PIN, and Billing ZIP Code from your current carrier (required by the new carrier)
- Contact your new carrier's porting department and request a port-in; ask which documents they need
- Provide your account details and confirm the port initiation date
- Monitor both your old and new accounts until the port is complete; once live, your old service stops automatically
Keep your old SIM card active during the port. Don't cancel your old service manually—let the port completion handle it.
Carrier-Specific Considerations
If you're porting from a prepaid service (like Boost Mobile or Metro by T-Mobile), some postpaid carriers charge slightly more because prepaid accounts have fewer historical data points. Porting from a major carrier to prepaid is often free or under $10.
MVNO carriers (which lease networks from the big three) usually charge $0–$15 to accept ports and may have faster processing because they handle fewer complex account structures than legacy carriers.
How to Minimize Costs
- Time your switch: Port during carrier promotions that waive porting fees and offer ETF credits
- Check for early renewal windows: Some carriers allow guilt-free exits 30–60 days before contract end; this avoids ETF shock
- Bundle services: Porting while adding home internet or switching multiple lines can unlock additional discounts
- Compare total cost of ownership: Don't focus only on port fees; factor in monthly rate, device pricing, and contract terms for 12–24 months
Frequently Asked Questions
Q: Can I port my number if I'm still in a contract? Yes, but your old carrier will charge an early termination fee. Confirm the ETF amount before initiating the port so you can evaluate whether your new carrier's promotion offsets the cost.
Q: Will my number work immediately after porting? No—allow 1–5 business days for the port to complete. Your new carrier will notify you when your number is active on their network.
Q: What happens to my voicemail and text messages during a port? Your voicemail resets on the new carrier; text messages don't transfer automatically. Back up important SMS before porting.
Ready to switch carriers without losing your number? Compare plans, porting fees, and promotional offers from trusted Mobile & Wireless Carriers on Mercoly to find the best deal for your situation.