Running out of storage space on your phone is not a lot of fun. You can always have your contacts and content backed up to the cloud. The PhotoCube can also help. It is a flash drive that automatically backs up your iOS/Android device. It gets the job done while you are charging your phone.
The device is password and Face ID friendly. It can serve as a regular USB flash drive too. You can unplug at anytime and complete the backup process later. Once your data is backed up, you can plug in your new phone and restore all your data. This product is expected to ship in March.[where to get it]