The Complete Guide to Switching to Rakuten Mobile with MNP (With Time Estimates and Timing Tips)

Good morning, it’s まさきん.

Let me start with the conclusion: switching to Rakuten Mobile with MNP takes about an hour in practice. As long as you prepare ahead, there’s nothing to be nervous about.

Your phone number stays the same. The whole process can be done from your phone or computer.

I normally work as a digital marketer, mapping out processes like this for a living. I’ll walk through it with that lens, mixing in what I learned switching my own main line. Let’s go through everything from preparation to confirming your new line is active.

First, what MNP actually is

MNP (Mobile Number Portability) is the system that lets you switch carriers while keeping your phone number. The mechanism is the same across carriers, not just for Rakuten Mobile.

It’s simply the official process for carrying your current number over to a new line. Only the contract holder can do this for their own line. Everything in this guide sticks to that official process.

The best time to switch is near the end of the month

Before the steps, let’s talk timing. A lot of people worry about getting double-billed.

Most major carriers don’t prorate the month you cancel. If you cancel early in the month, you’re charged for the full month anyway.

Rakuten Mobile’s first month isn’t prorated either — instead, the fee is tiered based on how much data you use between your contract date and the end of that month.

Put those two together, and applying near the end of the month tends to minimize waste. As a rule of thumb, aim for somewhere between the 20th and 25th.

That’s the logic I used when picking my own switch date — keeping the old carrier’s billing period short while also keeping data use low in Rakuten Mobile’s first month, to minimize the total cost.

One more thing worth knowing: “MNP one-stop” service. If you’re switching from a carrier that supports it, you don’t even need to get an MNP transfer number yourself. I’ll cover that difference in the next step.

The whole process breaks down into five steps.

Let’s look at each step in detail.

Step 1: Preparation

First, check the status of your contract with your current carrier. There are three things worth confirming in particular:

• Your name on the contract, phone number, and any identity-verification info (used for identity checks)
• Whether your device supports Rakuten Mobile’s frequency bands. Devices with SIM locks in particular need to be unlocked beforehand.
• Whether you’ll use eSIM or a physical SIM. eSIM-compatible devices let you switch over the same day, shortening the gap before your new line is active.

When I switched, I put off unlocking my SIM lock without really thinking about it. Then, right when I was ready to apply, I ended up scrambling to unlock it at the last minute.

Unlocking itself only takes a few minutes online. But doing it ahead of time makes the actual switch day go a lot more smoothly.

You can usually unlock it from your current carrier’s account page. So once you’ve decided to switch, I’d recommend checking this first.

One thing to watch for: check whether canceling will trigger an early termination fee or leave a remaining balance on your device. It’s also worth checking your current contract’s renewal month and cancellation terms.

Any remaining device balance just continues as payments to your current carrier after you switch — it’s not billed all at once, so you can relax on that point.

Step 2: Getting your MNP transfer number

An MNP transfer number is issued by your current carrier, and passing it to your new carrier is what carries your number over.

That said, if your current carrier supports “MNP one-stop” service, this step isn’t needed at all — Rakuten Mobile’s application screen lets you handle the cancellation together with your application. You can check whether your carrier is supported in the guidance shown during the application.

Getting the number is usually done through each carrier’s account page or app. You can also get one over the phone.

Most major carriers support issuing it online through their account page, in which case it typically takes 5–15 minutes.

If you go through the phone line, you might run into wait times during busy periods, so leave yourself some buffer.

One thing to watch for: MNP transfer numbers expire — usually after about 15 days. Once it expires, you’ll need to get a new one. So I’d recommend moving on to the application the same day or the next day after you get your number.

Step 3: Applying to Rakuten Mobile

Once you have your MNP transfer number ready, move on to applying to Rakuten Mobile. You’ll mainly need three things:

The application form asks for your name, address, and other contract-holder details. You’ll also enter your MNP transfer number and its expiration date. This is also where you choose your SIM type (physical SIM or eSIM) and whether to bundle a device with your plan. Filling it all in takes about 15–20 minutes.

One thing to watch for: if the name on your application doesn’t match the name on your MNP transfer number, it can get sent back during review. If you’ve recently changed your last name — say, after getting married — it’s worth double-checking that your current carrier’s records are up to date too.

By the way, you can also apply through the link below. The process itself is identical to applying directly. Going through an employee referral sometimes comes with extra perks, so I’ll leave it here just in case.

Step 4: Receiving and switching over your SIM/eSIM

Once your application is complete, if you chose a physical SIM, it’ll be mailed to your home — typically arriving within 1–3 days.

With eSIM, there’s no waiting for mail. You can download the profile online as soon as your application is done. If speed matters to you, eSIM might be the better fit.

Once your physical SIM arrives, just swap it into your device and follow the setup instructions. For eSIM, it’s just scanning a QR code and installing the profile. Either way, I’d budget about 10–20 minutes for the actual work.

When I actually made the switch, I did it on a weekend morning. Maybe because my Wi-Fi was stable, but the eSIM profile setup finished in just a few minutes — almost anticlimactically quick, from what I remember.

That said, if you’re somewhere with weak signal, the setup can get finicky. I’d recommend doing this somewhere with a stable network, like at home.

Step 5: Confirming activation and completing the line switch

Once setup is done, check that you can make calls. Also check that data works.

The line switch itself happens automatically. It can take anywhere from a few minutes to about an hour depending on congestion.

During the switch, both your old and new lines might be temporarily hard to reach. So it’s worth avoiding anything time-sensitive — like an important call or an SMS verification code — during that window.

Once the switch is complete, your old carrier’s line is automatically deactivated, and from then on you’re using Rakuten Mobile. Just to be safe, it’s worth testing all three: making/receiving calls, sending/receiving SMS, and data.

One thing to watch for: after the switch completes, cancellation on your old carrier’s side is handled automatically in most cases. That said, how prorating and your final bill are calculated varies by carrier. It’s worth checking your final statement on your old carrier’s account page, just so you’re not left wondering “wait, what’s this charge?” later.

Wrap-up

Switching to Rakuten Mobile with MNP isn’t difficult, as long as you take care of the prep work first. Clearing out the things that tend to cause delays — unlocking your SIM, gathering your ID documents — ahead of time is, in my experience, the real key to a smooth switch.

Just keep an eye on your transfer number’s expiration date, and pick a time with some breathing room, like a weekend, to get started. You should be up and running on your new line in well under half a day.

I went through this myself with my own main line. Compared to the effort involved, I think the benefits are substantial.

If you’re considering switching, I’d recommend Rakuten Mobile as a strong option. Start by checking their plans and coverage on the official site.

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