Re: i cannot access my email on iphone 4s, why not
Welcome to iMore! It could be a wifi issue, or a cellular issue. Try Reset Network Settings. Settings>General>Reset>Tap Reset Network Settings. You may need to enter your wifi passcode back in afterwards
If that does not work, go to Settings and delete the email account. Then do a hard reset.Hold the top power/sleep button and the home button at the same time until the Apple logo appears, then release. Then add the email account back in.
Sent from my ancient but trustworthy iPhone 5.