[Review] Just got back from 10 days in Tokyo/Osaka. WaySim eSIM is the real deal.

I’ve seen a lot of people asking about eSIMs for Japan recently (Ubigi vs. Airalo vs. Holafly). I decided to pull the trigger on WaySim for my latest trip to Tokyo and Osaka, and honestly? I’m impressed.

Quick breakdown for anyone looking for reliable data:

• The Plan: I grabbed their "Japan 4G High-Speed Truly Unlimited" (3-30 days options).
• The Setup: Standard QR code delivery via email. I activated it while waiting at the gate in Taipei, and the second I hit the tarmac at Narita, I had a 4G connection. No messing around with APN settings manually.
• Coverage & Speed: * Tokyo (Shinjuku/Shibuya): Solid. Even in the depths of Shinjuku Station (the labyrinth from hell), I didn't lose Google Maps.
  • Osaka (USJ): This was the real test. Usually, crowds kill the bandwidth, but I was pulling consistent speeds high enough to stream 4K TikToks while waiting in the Nintendo World line.
  • Carrier: It seems to hop between KDDI and Softbank. This is key because if one tower is congested, it usually picks up the other.

The Pros:

• Actually Unlimited: I didn't get throttled once. I used about 4GB in one day just uploading raw footage to Drive, and it stayed fast.
• Price: Way cheaper than roaming with your home carrier and more convenient than carrying a bulky WiFi puck that dies in 4 hours.

The Cons:

• No Phone Number: Like most travel eSIMs, it’s data-only. If you need to make a voice call to a local restaurant for a reservation, use Skype or Viber.

Verdict: If you’re sticking to the major cities, skip the physical SIM cards and just go with WaySim. It’s one less thing to carry, and the "Truly Unlimited" claim actually holds up.