Fairphone 5 / Ubuntu Touch 24.04 daily: LINE Mobile Japan SoftBank SIM working with mobile data, calls and SMS

Nkku

Hi,

I would like to report a successful mobile network test on Fairphone 5 with Ubuntu Touch 24.04 daily in Japan.

Device:
Fairphone 5

Ubuntu Touch:
24.04-1.x daily
Channel: 24.04-1.x/arm64/android9plus/daily
OS build: 24.04-1.x (2026-04-29)
Kernel: 5.4.302-qgki-g4ddb22d91965 (arm64)
Device image: 20260225-31133

Carrier:
LINE Mobile Japan, SoftBank network

APN:
Name: LINE mobile
APN: line.me
Username: line@line
Password: line
Authentication: PAP
Protocol: IPv4 / ip
Type: internet
Preferred: true

Confirmed working:

Mobile network registration
Mobile data
Incoming calls
Outgoing calls
SMS sending
SMS receiving

Notes:
At first, the SIM did not work. oFono repeatedly showed:
data reg changed 2 -> 3 (denied), attached 0
data reg changed 3 -> 2 (searching), attached 0

Trying to activate the APN context failed with:
org.ofono.Error.NotAttached: GPRS is not attached

I manually configured the LINE Mobile APN, enabled RoamingAllowed, removed the automatically created SoftBank jpspir APN context, and also performed a daily-channel system update.

After leaving the phone idle for a while, it eventually registered successfully. I cannot yet determine whether the fix was caused by the update, APN/oFono changes, removing jpspir, a delayed network registration, or a combination of these.

This may be useful for Japanese users trying to use SoftBank-based MVNO SIMs on Fairphone 5 with Ubuntu Touch.