iPhone model: iPhone 4 (More information in my signature) Does device last all day on one charge?: Almost always, yes. How much battery left at end of day? Depends, yesterday was only 18% and they day before that was around 10% or so.
i have a 4S and usually it will last me at least a full day on a full charge, usually 1.5-2 days depending on how heavy my usage is.
iPhone 4S No 0% I unplug at 6:35am and have 20% left at 3:10pm when I get home from school. I listen to music and play games at school so thats why. If I text all day plus do the music and games, it ends up at literally 1% when I get home at 3:10. I have a pretty strict school schedule Always do the same stuff at the same time. Can't listen to music on my hour bus ride after school, or my phone dies
iPod touch 4g 10-20% I don't use it at school much (games), but at home I do (browse web, watch YouTube, music)
iPhone 4s Moderate use u usually have 40%-50% Normal day use for me(facebook,instagram,email,etc)when I arrive home it's at 10%-20%. I need to charge it every night or else it wont last.
I got a new phone iPhone 4S iOS 5.0.1 Jailbroken Yes I get about 8 hours of usage with my new phone. At the end of the day I'm usually at 30% or more.