Since i got my phone with a contract, i had it for almost two years.
Then i decided that contracts are a huge pain in the …behind and i got rid of it buying my Nexus 5.
Hopefully i’ll have it for another 2 years
I would say about 1 a year probably not even that sometimes if the phone I currently have is working great for me. I got a new phone myself this year just a few months ago and I am hoping that one lasts me a while and I don’t need another at least for a year or so.