Guide · Changing telco the safe way
How to switch carrier without losing your number.
Fear of losing the number is what keeps most people on a plan they know is too dear. It should not, because your number is legally yours to take with you, and moving it is routine. There is exactly one rule that protects it, and one order of operations that means almost no downtime. Get those right and switching carrier is a fifteen-minute job that can knock a real amount off the bill. Here is how porting works, and how to do it without a single anxious moment.
Last updated 4 July 2026 · by Alien IT Solutions
The one rule: never cancel first
If you remember nothing else, remember this. Start the new service and port the number across. Never cancel the old service first.
This is the whole safety mechanism. When you sign up with a new carrier and ask to port your existing number, the port process itself closes your old account as it pulls the number over. The number is protected the entire way because it never gets released into the void. The way people lose a number is by cancelling the old service first, thinking they are tidying up, which can release the number before the new carrier has claimed it. Sign up and port first; let the port do the cancelling. That order is the difference between a smooth switch and a lost number.
How to switch, step by step
The whole thing is short. Most of it is preparation.
1. Check what you owe on the old account
Before anything, confirm whether you are still paying off a phone or inside a contract term. The number ports regardless, but a device balance or exit cost may apply, and you want no surprises after the fact.
2. Gather your details
You will need your existing number, your current account details, and identification for the new carrier's checks. On prepaid you may also need the SIM's own number. Missing details is the number-one cause of a stalled port.
3. Sign up with the new carrier and request the port
Start the new service and, when asked, choose to bring your existing number rather than take a new one. This is the port request. Enter your number and old account details exactly as they appear.
4. Put in the new SIM and wait for the switch
The port completes, often within hours and sometimes minutes. There is usually a short window where the number moves across; when it lands, your service is live on the new carrier and the old one closes itself.
What actually happens during the port
People imagine days of chaos. The reality is usually a brief, quiet handover. For a straightforward mobile port, there is a short window, frequently just minutes, where the number is being moved from the old network to the new one. You slot in the new SIM, the port completes, and calls and texts start arriving on the new carrier. Pick a time you can spare a few minutes without needing the phone for anything urgent, and you will barely notice it.
When a port takes longer, it is almost always a details mismatch: a name or account number that does not match what the old carrier holds. The number is not lost, it is just waiting on a correction. Fix the mismatched detail with the new carrier and the port resumes. Landline ports involve more steps than mobile and can take longer, which is worth knowing if you are moving a home number.
Before you switch, make sure it is worth it
Switching to save money only helps if the new plan genuinely fits how you use your phone, so it is worth pinning that down before you port. If a bill jump is what set you thinking, our guide on why a phone bill spikes helps you check whether the real fix is a new carrier or a corrected charge on the current one. And if you are weighing the type of plan as well as the carrier, prepaid vs plan covers which structure suits your usage. Switch once, to the right thing, rather than twice.
Questions people ask
Can I keep my phone number when I switch carrier?
Yes. In Australia your number is yours to take with you, and moving it between carriers is called porting. When you sign up with the new carrier, you request to port your existing number across rather than take a new one. Done this way the number transfers over, usually within a short time, and you keep it.
What is the one rule that protects my number when switching?
Never cancel your old service first. Start the new service and port the number across, and let the port itself close the old account. If you cancel the old service before porting, the number can be released and lost. So the golden rule is simple: sign up and port first, never cancel first.
Will my phone stop working during the switch?
Only very briefly, if at all. During a port there is usually a short window, often minutes, where the number moves from the old network to the new one. You put the new SIM in, the port completes, and service returns on the new carrier. Plan the switch for a time you can spare a few minutes without needing the phone.
What do I need before I switch carrier?
Your existing number, your current account details or the account number the old carrier uses, and identification for the new carrier's checks. If your current service is prepaid, you may need the SIM's own number too. Having these ready makes the port smooth; missing details is the most common cause of a stalled switch.
Can I be charged a fee or held to a contract when I leave?
You can port a number away freely, but if you are still paying off a phone or are inside a contract term, you may owe the remaining device balance or an early-exit cost. That is separate from the number itself, which still moves. Check what you owe on the old account before switching, so there are no surprises after the port.
How long does it take to port a number?
Often it is quick, completing within hours and sometimes minutes for a simple mobile port. It can take longer if account details do not match or the number is a landline being ported, which involves more steps. If a port stalls, it is almost always a details mismatch, and correcting the detail with the new carrier gets it moving again.
Thinking of switching but not sure it is worth it?
Send us your current bill first. We will tell you honestly whether switching saves you real money or whether a better plan on your current carrier does the job, and we will make sure the number moves safely. The audit is free.
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