The best phones for under £100

Hey Im looking for the best phone for under £100. All i want is something sturdy as i used to have the nokia express music and the screen broke and the buttons fell off. Poor quality and now i have to find a new phone. Something with decent battery life, and loud, clear speaker for calls. I hate having to put my phone on speaker just to hear someone talk. I'd like it to fit in my pocket, and preferably not be completely hideous ! Any network is fine, i'll just get it unlocked . If you have any suggestions please let me know.