Brittany P. August 15, 2018 20:23 Updated The Easy One Touch Car Mount can hold devices up to 3.5 inches in width, which includes an iPhone 5S. Related articles What is the maximum width of a smartphone that an iOttie Easy One Touch Mount can hold? Will the Easy One Touch 4 Series hold the iPhone 5S? What material are the side arms that that hold onto your phone? Will it damage or scratch it? Comments 0 comments Article is closed for comments.