If I'm at work, I use the work phone.
If I'm home, I use the home phone.
If I'm between the two, I really don't need to waste my time jabbering with or texting my "BFF" about the days sports scores.
I got my elderly mom to go with that plan. Saves her at least $30/month.
I just had to have "a talk" with hubby about our T-Mobile, he went over the monthly allotted minutes using it for local calls all the time and we got hit for it big time. What you do is the exact advice I gave him. I rarely ever use my phone except to call my Mom long distance twice a week and my daughter once a week and those conversations usually don't last more than 15 minutes max.