Choose which account places your calls
You make this choice only if you have a chat account that can make calls (learn more).
- Open Phone > Menu (upper left) > Phone Preferences.
- Under Domestic Calls and International Calls, tap Use and choose an account, or Always Ask.
- Tap Done.
If you choose Always Ask, Phone asks Which service would you like to use? each time you dial. Tap an account. To skip this question next time, first select Always use this service for these calls.
Service codes and emergency numbers always go over your SIM card.
These steps haven’t been confirmed on LuneOS yet, so some may differ.