What is APN (Access Point Name)?

Table of content:

APN (Access Point Name) is a small but essential network setting that tells your phone how to connect to the internet through a mobile operator.
You can think of it as a “route” your device uses to reach the correct servers and access mobile data.

Do I need to configure APN manually?

In almost all cases - no. With Ohayu, APN settings are configured automatically during eSIM installation. For 99% of users, nothing else is needed.

If your eSIM is installed, shows signal, and mobile data works - the APN is correct.

How does an APN work?

Each time your phone tries to use mobile data, your operator checks your APN to determine:

which network gateway to use,
which IP address to assign to your device,
which security rules and protocols to apply,
how your traffic should be routed (e.g., internet, MMS, VoLTE).

Without the correct APN, your phone may show signal, but internet won’t work - the device simply doesn’t know where to send data.

Why do manual APN issues happen? (edge cases explained)

Automatic APN setup is very reliable, but there are rare situations where the device does not load APN correctly.
This usually happens due to one of the following:

Very weak or unstable signal during installation
Low bandwidth (e.g., crowded airport Wi-Fi)
Temporary network conflict on the device
Device-specific quirks on older or highly customized Android models
Or simply: the phone did not fetch APN settings for no clear reason

When this happens, your eSIM may be installed but mobile data won’t activate until the APN is entered manually.

This is normal - and happens across all eSIM brands.
The good news: it takes less than a minute to fix.

How to update your APN settings

Step 1: Check your APN in the Ohayu app

Open the Ohayu app and go to the My eSIMs tab
Tap your eSIM to open its details
In the Plan details section, you’ll see your APN (Access Point Name) — copy it