According to Gartner, worldwide smartphone sales in the fourth quarter of 2017 declined for the first time since 2014. One reason: users are choosing better models that last longer, slowing upgrades to new models.

https://www.itbusiness.ca/news/smartphone-sales-record-first-ever-decline-in-q4-17/99530?sub=222097&utm_source=222097&utm_medium=deptenduser&utm_campaign=enews&scid=d5e9e370-f88c-36f0-7c4b-4e6005b29238