Phones have come a long way.
If anyone is looking to do data analysis on an Android phone, Pydroid 3 is a stand-alone app which runs Python without a cloud server.
Pythonista on an iPhone.
Both allow download of data science modules.
pandas - for data table/frame manipulation
numpy and scipy - mathematics/statistics libraries
matplotlib - for graphing/charting
Pydroid will also do tensorflow and pytorch.
iPhone Pythonista example
Android Pydroid 3 example