phones tend to last phones tend to last "Life Expectancy of a Smartphone" phones tend to last phones tend to last phones tend to last 21 months 21 maanden 21 months phones tend to last "Life Expectancy of a Smartphone" 21 months phones tend to last phones tend to last phones tend to last 21 months 21 months Chron phones tend to last phones tend to last average life expectancy of a smartphone is 21 months 21 months 21 months phones tend to last phones tend to last phones tend to last 21 months phones tend to last