I got a new phone yesterday. It's an interesting experience getting a new phone because it is the tool most integral in your daily life (or mine anyway). Getting rid of an old phone means purging texts and call logs and a bunch of other stuff that represent good times, bad times and every other kind of time.
So a new phone is a fresh start, a fresh start with a new partner. If you go by the contract you sign, you've just acquired your sidekick for the next two years.
Your new relationship with your phone is like any other new relationship. It takes some time to figure out the new partner, and even more time to get comfortable with the differences between this relationship and all those previous. And like every partner in life, this one will deliver both joy and misery, irritate the hell out of you sometimes and wear out when you won't just shut up.