We got my dad a Huawei phone for his Christmas and he had never used a smart phone in his life. He loves it. OP - you say you have a tablet. A smartphone will basically work in the same way as your tablet, and will have additional icons for phoning and texting. If you can maybe pop into the Vodafone store (I’ve found them a great help) and explain your dilemma - I’m sure they’ll help you out.
Can I use my bus pass on London buses?