1Turn on USB debugging

1. On the phone, open Settings, then About phone (on some phones it is under System).
2. Press Build number seven times, until the phone says you are a developer.
3. Go back to Settings, open Developer options (under System on some phones) and turn on USB debugging.
4. Plug the phone into the computer. When the phone asks to allow USB debugging, choose Allow.

2Check the phone is connected

Lists the phones your computer can see. Yours shows with device beside it. unauthorized means allow USB debugging on the phone; nothing listed means check the cable and that USB debugging is on.

3Install the keypad app

Checking the newest build…

4Make Sonaline the device owner

Optional, once per phone. It lets Sonaline install its own updates with no confirmation, and makes Send message in the phone's Contacts and call history open Sonaline.

Remove every account first. Android refuses this while any account is on the phone: Google, the carrier's, the manufacturer's. Remove them in the phone's Settings, under Accounts, run the command, then add them back.

On Android 7, Sonaline's own account counts too. Copy contacts to the phone makes one. Turn it off first in Sonaline, under Settings, Account, and turn it back on after. On Android 8 and later it can stay. To see the Android version, open the phone's Settings, then About phone.

An answer that starts with Success means it worked: in Sonaline, Settings, Account, Automatic updates now says On. If Android refuses:

…already some accounts on the device

An account is still on the phone. Remove every one under Accounts in the phone's Settings and run it again. On Android 7 that includes Sonaline's: turn off Copy contacts to the phone. To list the accounts left:

adb shell dumpsys accountCopy

Each line that starts with Account { is one, with its type, such as com.google.

…already several users on the device

The phone has a second user or a guest. Remove them in the phone's Settings, under Users or Multiple users, and run it again.

…device owner is already set

An app is the device owner already. If Automatic updates in Sonaline says On, it is Sonaline and there is nothing more to do. Otherwise another app holds the role, and only that app (or a factory reset) can give it up.

Can't set package … as device owner

The phone may not allow a device owner at all. Check with this command. A line that says feature:android.software.device_admin means it does; no line means it does not, and updates stay one tap under Settings, About.

adb shell "pm list features | grep device_admin"Copy

Unknown admin

Sonaline is not installed on the phone, or the name was mistyped. Install it (step 3) and copy the command again.

Troubleshooting

Saves what the phone logged recently to sonaline-log.txt, in the folder you are in, to send to support.

The same, Sonaline's lines only, with Sonaline open on the phone. For a Mac or Linux. Android 7 phones may not have pidof, and Windows cannot run it: use the one above.

Prints the installed version, like versionName=3.2.15. The quotes make the phone do the search, so it works on Windows too.

On the phone, open Sonaline, then Settings, Account, Automatic updates, and choose Stop. Updates ask for a tap again, and Send message goes back to the phone's Messages app. There is no adb command for this: Android answers Attempt to remove non-test admin to dpm remove-active-admin for an app installed the normal way.