I can no longer access my Yahoo email account on my iphone 4. why?

Hi I have been having the same problem since Thursday on my phone I can no longer get any yahoo emails on the iPhone it keeps connecting but won't download leaving a blank page. I have tryed all the advice and gone through lots of things like reset the phone. Vodaphone say the phone is fine. It must be yahoo but I can accsess it fine from my laptop. Any other suggestions would be greatly appreciated

NEW YAHOO! MAIL IS STILL UNSTABLE....IT WOULD BE BEST TO GO BACK TO YOUR PREVIOUS VERSION OF YAHOO! MAIL... To go back to YAHOO! MAIL CLASSIC... Turn off Javascript - you'll then be asked if you want to return to Mail Classic, click "yes". If you don't know how to turn off Javascript... For SAFARI: Open SETTINGS>click PREFERENCES>>click SECURITY>>Uncheck ENABLE JAVA and ENABLE JAVASCRIPT IMPORTANT:Remember to RE-ENABLE JAVA and JAVASCRIPTING back ON when you are back in Mail Classic because without it some mail functions won't work. For IE: Open TOOLS > INTERNET OPTIONS >> SECURITY. In security click "CUSTOM LEVEL" -> disable active scripting in the scripting section. IMPORTANT:Remember to turn JAVASCRIPTING back ON when you are back in Mail Classic because without it some mail functions won't work. For FIREFOX: Open TOOLS -> OPTIONS -> CONTENT, click on "DISABLE JAVASCRIPT". Now hit F5 to refresh the page while you are in Yahoo! email in order to switch back... In the options, click (PERMANENT) to switch back to YAHOO! Classic. DO NOT click the "ONE TIME ONLY" option. IMPORTANT: Turn JAVASCRIPT back ON once you have your "CLASSIC" account back. PLEASE ACKNOWLEDGE IF THIS SOLUTION WORKS BY CLICKING BEST ANSWER..THANKS