If you're wondering what iPhone size you have so you can order the right Wildflower Case... check this image below for a quick size reference. The iPhone 6/7/8 Plus is the biggest, with iPhone X and Xs (or 10/10s) slightly smaller and iPhone 6/7/8 regular size being the smallest. New 2018 iPhone sizes also include iPhone Xs Max and iPhone Xr. We hope this helps!
You can also go to System Preference/Apple ID then scroll down and it show what iPhone model you have. We hope this helps you order the right size case!