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Breakpoints perfect on designer - But footer contact detail is wrong colour & place on mobile phone

On all of my breakpoints in the designer, my design seems flawless, however on some iPhones and tablets, a phone number is out of place and the wrong colour.

No idea how to fix it so that my client can see its correct on his phone - don’t know what to do as I can’t see anything from my end!

Here is my site Read-Only: LINK
(how to share your site Read-Only link)