I can not access my mail with the iPhone 3GS, it's not compatible with ios7 nor can I get there via the full site.
Please have a kind chat to your web developers/ designers to fix the problem.
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Maria Cameron commented
It is not your phone, I have a Samsung and am having no end of problems with it, it is Yahoo itself, I went to Telstra about it they told me to phone them up, It is using all of my data and I'm in for a huge phone bill