I'd recommend first identifying specifically where your cellphone camera is coming up short. For me, it was the ability to zoom in on things that were too far away to capture well on my phone. So I looked for that when I was looking for something else to take along on the bike. I ended up buying a Nikon camera through eBay that was being sold by the Salvation Army. And it has served me well. And since I paid only $20 for it, if it breaks I can afford to replace it.