Sorry to hear that. But the carriers typically give a 2 week to one month trial period when you either start service or upgrade a handset, at least in the U.S.. That's when you should have been covering all your requirements so you don't end up w/ buyer's remorse.
I have been a huge Apple fan since I bought my first Mac (and iMac) about 5 years ago so I was VERY surprised and shocked at how much I absolutely HATE this crummy phone 4s.. I had a Samsung Galaxy and should NEVER Have switched. The calendar is absolutely horrible and is unusable (primarliy due to a selection of Alerts that are not usable and the inability to snooze a Notification), there is no back button on the phone, no menu button (both like the Android)_ and I keep hitting brick walls in the OS (now 6) apps that it completely drives me crazy!!!! I can't believe how much people love a phone and OS that I find was developed with absoluttely no concern for the user.
Now I am stuck with this crummy phone.