If you never seem to get a donation when using your iPhone or iPad, then this could be because you're blocking cookies. This guide will show you how to check your settings to ensure nothing is being blocked.
1) Open the Settings app.
2) Select Apps (some iOS versions may not have the Apps link – please skip to the next step if this is the case)
3) Select Safari
4) Scroll down to Privacy & Security and Make sure Prevent Cross-Site Tracking is switched off
5) Scroll down to the bottom and click Advanced
6) Then make sure Block all cookies is switched off