The Universal Phone Adapter is a stick-on adapter suitable for all types of smartphones. This adapter is compatibile with Zéfal holders. The Universal Phone Adapter can be used with all types of phones and cases except ones made from rubber, silicon, TPU and other soft materials. Choose a flat, non-pourous surface (e.g. hard plastics) to attach the Universal Phone Adapter to but once it has been fit, it cannot be removed or reused. Not available in the USA.