The Android app for online TM 30 reporting is called Section 38. You can find it on the Google Play Store using the link: https://play.google.com/store/apps/details?id=th.go.immigration.section38.
you used to be able to do it on their website, I did it on my laptop. I'm assuming you still can but I haven't done one for nearly a year now so don't know for certain if that option is still available.
Hopefully there is a simpler way to do this via the laptop without jumping through all these hoops. I am a dinosaur with mobile phones but much more competent on a computer. Unless I get my Thai mate to download it on to his phone when I arrive.
not the SIM card is the point. You only see section 38 app at Google Play with an Thai Google account. So create a new Google account with location TH.