Whether it is swapping to a new smartphone , recovering data and settings after a disaster you really need to ensure that you back up your smartphone – Android or Apple.
Apple – iPhone
iPhone users should be using iCloud backup – makes it so much easier as it creates a snapshot of your phone so that all your apps and data is duplicated over
Apple give you 5GB of space but really you should be putting your hand in your pocket and paying the $1.49 a month for 50GB of data if you have used the 5GB they give you for free
This also makes changing iPhones very easy as you restore from an iCloud backup – your phone will be the same as the last backup – Apps , photos , login passwords , contacts , calenders.
Here is a link to using iCloud: iCloud Support
Google – Android Smartphones
Android owners should ensure that backup is turned on for Google and that you know your Google email and password , turn on backup all data and settings.
If you cannot remember your Google password , try this link Recover Google Password
Below is a link to a great article on Android backup