I prefer my landline for long, intimate conversations. While my smartphone comes in handy, talking seems shallow.
I've found a headset works better for long conversations but you can find phone handsets that connects to smart phones.
https://www.amazon.com/VTech-LS916-Retro-Handset/dp/B00CGYCNYO/ref=sr_1_5?crid=1D71EKESFDXIX&keywords=smart+phone+handset&qid=1643078972&sprefix=smart+phone+handset%2Caps%2C67&sr=8-5