Based on the search results, I would recommend either the Samsung Galaxy A02 or the Spark Go 2024. Both of these phones have 32 or 64GB of storage so you'll have plenty of room to download Uber and other apps. They are also dual SIM so your mother can use two phone numbers. The Samsung Galaxy A02 is available for R2219 and the Spark Go 2024 is R1899, so both are well within your budget for simply needing a phone for ordering Ubers and basic apps. Let me know if you have any other questions!
