We created the CupFone XL phone holder to hold XL sized phones that have THICK PHONE CASES. 

Approximate Width Range: 2-7/8" to 4-1/8" Depth: 5/8" 
Exact Width Range: 2.86" to 4.11" Depth: 0.67"
If you have an XL phone (Apple, Samsung, etc) with a regular SLIM PHONE CASE, then buy the regular CupFone.
If you have an XL phone (Apple, Samsung, etc) with a THICK PHONE CASE, then buy the CupFone XL.