[Definitive Guide] Pre-SIM Switch "Digital Decluttering" Checklist You Need More Than the Switch Itself ✅

*This article contains PR for sumaho-norikae.com.
For SoftBank smartphones! [sumaho-norikae.com]

Switching SIMs was easy. The problem was what came before and after.

"Your MNP one-stop application has been accepted."
Seeing this notification, I thought, "Yes, that's it, I'm done." The switch to IIJmio was successfully completed. But in reality, this was just the beginning.

The actual process of switching SIM contracts has become truly simple. The procedure takes less than an hour. However, what was waiting for me before and after that was cleaning up the digital "hoarder's house" I had accumulated over many years.

Accounts, subscriptions, authentication credentials. Before I knew it, my smartphone was full of things I didn't use. The switch forced me to face all of these.

This time, I will share the "pitfalls" I encountered so that those who are about to switch don't make the same mistakes.

The story of getting stuck in the swamp of information gathering

When I decided to switch to a budget SIM, I first started obsessively researching "where is the cheapest."

Device sale information, cashback conditions, the trap of 10,000 yen smartphones. Before I knew it, I had spent my entire weekend visiting comparison sites. But there was so much information that I became unable to make a decision.

What I realized here is that if you chase "cheapness" too much, you lose sight of your original goal. What I wanted to do was reduce communication costs and switch to a comfortable service. Yet, before I knew it, my goal had become "finding the lowest price."

I stopped and set my priorities

I wrote it down on paper.

• How much data capacity is needed per month (check actual usage)

• What is the budget limit?

• Which network do I want to use (Docomo? au?)

And I set a deadline for information gathering to "by this weekend."It doesn't have to be the lowest price. If it's a price I can accept and it has the necessary features, that's enough.
Once I decided that, it was easy to make a choice.

The mistake of buying a device and SIM at the same time

Another thing I almost messed up was trying to buy a new smartphone at the same time as switching my SIM.
Thinking about it, it's obvious, but this means doing three major tasks at once: "SIM activation," "initial setup of the new device," and "data migration."
When a problem occurs, you won't be able to tell at all if it's a network issue, a device issue, or a data migration issue.

The order I followed

1. First, I switched only the SIM on my current smartphone

2. I confirmed that the connection was stable

3. After that, I bought a new device and took my time migrating the data

This alone made troubleshooting overwhelmingly easier.

The hurdle of "What are Type A and Type D?"

When I looked at budget SIM websites, this was the first thing that confused me. What do "Type A" and "Type D" mean?
I looked it up and found out.

• Type A = au network (A for au)

• Type D = Docomo network (D for Docomo)

You must check the "List of Verified Devices" to see if your smartphone is compatible with the network you chose. If you get this wrong, your connection could become unstable, or in the worst case, it might not connect at all.

Digital decluttering was the hardest part

Once the SIM activation was finished, it was time for data migration. That was when I was stunned by what was on my phone.

• Apps I installed three years ago and never opened once

• Subscriptions I forgot why I even signed up for

• Old accounts where I don't even know the password

Did I really need to bring all of that to my new phone? The answer was no.

Criteria for decluttering before migration

• Unused apps → Delete anything not launched in the last 3 months

• Subscriptions kept out of habit → Cancel

• Accounts with inaccessible linked services → Delete

Doing this during the "preparation phase" of switching was the right move. It is overwhelmingly easier than trying to organize after moving to a new smartphone.

Caution! Accounts that will cause trouble if the transfer fails

I was especially careful with these apps during data migration.

Two-factor authentication apps (Google Authenticator, etc.)

If you don't back these up before migrating, you won't be able to log in to other services. I saved my backup codes in advance.

LINE

Confirm your PIN code and email address registration. If you don't do this, you risk losing all your friends and chat history.

Carrier email

Services that use your old carrier email (like @docomo.ne.jp) as a contact method need to be updated to Gmail or similar before you switch.

[January 2026 Only] Great deals if you apply now

Actually, Sumaho-Norikae.com is running a limited-time campaign until January 22, 2026.

Campaign details:

• 20,000 yen cash back on all iPhone models20,000 yen cash back

• Select Android models (arrows We2, Galaxy A25 5G, etc.) for 1 yen

• Cases where the actual cost is negative

For example, in the case of the ✅arrows We2:

• Device cost: 1 yen

• Administrative fee: 4,940 yen

• Cashback: -20,000 yen

• Net cost: -15,059 yen (You receive money)

Compared to other online shops, this calculates to a savings of approximately 25,000 yen.

Eligibility:

• Switching from another carrier (MNP): All ages

• New contract: Ages 5-18

• Apply for any of the following: Merihari Unlimited+, Pay-Toku Plan, or Smartphone Debut 20G

The campaign runs until January 22nd, so if you are considering it, please act quickly💡🤗

Application tips: ⬇️
Google Pixel series "0122"
arrows We2 series "we" (case-insensitive)
Enter the campaign code in the application form to apply this benefit. Please be careful, as it will not be applied if you forget to enter it.

Sumaho Norikae.com Official Website

"Sumaho Norikae.com" is an [Authorized SoftBank Dealer]. Since it is an online contract, anyone living anywhere in the country can apply. Even those who are uneasy about online applications can apply with peace of mind.

What I learned from switching

The SIM switch itself was truly easy. What was difficult was the "digital life decluttering" that surrounded it.
However, by doing this work, my smartphone became organized and actually more comfortable to use. If you think of it as a once-a-year deep clean, it's not bad at all.

Checklist before switching

Before you switch, it is a good idea to check these things.

• Clarify the data capacity and budget you actually need

• Set a deadline for gathering information

• Purchase your SIM and device separately

• Check if your device is compatible with the chosen network

• Organize unnecessary apps and subscriptions

• Prepare for the migration of two-factor authentication, LINE, and carrier email

As long as you are prepared, switching is nothing to fear. In fact, it is a great opportunity to reset your digital environment.
Now, let's get started with the preparations.

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