I use my mobile and iPad to store books, patterns and anything to do with quilting. Out and about I am not able to connect with Internet but I take my iPad to classes to follow patterns. I store free patterns on a Peggy thing which I stick in machine. (Sorry learnt to use computer but never was told correct names).
I do have a few apps on my mobile phone. But as I live in a poor reception area it does't work all the time. I do store kindle patchwork books . I have found that if I use my main computer and size the templates I can print off very easily no tracing.