I have a couple of older relatives who only communicate via phone call and I hate talking on the phone. My other relatives don't stay in contact as often as I do, so I feel bad not reaching out and keeping them company.
Do you have any strategies to manage the energy drain from phone calls?
Take literal note of things that you see that you think they may find interesting. This way when the time comes it may feel like less effort because you have a reason behind the call and they'll hopefully enjoy the things you have to share. Plus, they'll appreciate knowing that you're thinking about them when you're not talking.