App for automatically switching on/off mobile data and Wi-Fi based on location

My mother uses a prepaid phone plan where mobile data usage is charged by the megabyte. It is currently not cost-effective to switch to a monthly fixed-cost subscription plan.

• When she is at home, she should:
  • Switch off mobile data.
  • Switch on WiFi (because her home WiFi has a fixed monthly cost).
• When she is outside home, she should:
  • Switch on mobile data (so that others can contact her using messaging apps such as Signal and WhatsApp).
  • Switch off WiFi (to conserve battery).

The problem: she often forgets to do the above. Sometimes she leaves home without switching on mobile data. Sometimes she accidentally uses lots of mobile data when at home.

Is there an app that can automatically switch on/off mobile data and WiFi based on the phone’s location? Location should be detected based on all the following data: latitude/longitude coordinates (if location is enabled on phone), WiFi networks in range (if WiFi is enabled on phone), and cell tower signals (if airplane mode is not on).

We would strongly prefer to use a privacy-respecting open source app for this. Phone: Samsung Galaxy A series. OS: Android 13.