I'd like to be able to change the network operator automatically.

For instance, I'm living close to a border and traveling every day from one country to another to go to work On my workplace, I cannot connect to my Home Network, so I'm using a foreign network operator on roaming. No problem with that. But when I go back home on evenings, I unfortunately live too close to the border and still have access to the foreign Network! Therefore, my phone does not switch-back automatically to my home network operator, and I'm still charged roaming costs even when I'm home.