Looking for a basic Verizon cell phone with call blocking

[Dennis S]

My mom is on my sister's Verizon plan and is happy with an old flip phone. In fact, the simpler the phone, the better for her. But she wants to drop her land line and use the cell phone with the number she's had since the 70's. She's been getting lots of wrong numbers, telemarketing calls, and surveys. So, I'd like to find as simple a phone as I can with call blocking features. If it takes a smart phone to have call-blocking, that's what I'll get her.