Phone that has sufficient storage (Pumpherston EH53)

This is probably a long shot, but thought I’d ask anyways.
My mum has a smart phone, but it’s a cheap one she got. Theres no storage on it at all, no space for a storage card.
I recently got her a Ring doorbell, however, she can’t put the app on her phone as there is zero storage space. I have the app on my phone, but it seems pointless as it’s her house & I don’t live there. It was meant for her to answer without struggling to get up, or to let the people know that she’s coming & to wait a moment.
An iPhone would be ideal, she’s never had one before & I feel it would be easier for her to use anyways. But, I am open to anything someone may have that will have sufficient space for the app.

Thanks for reading, I know it was quite long!! 😊
Can you help with this request?
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