Almost all smartphones. Some popular compatible models include:
Samsung Galaxy S7/S7 Edge/S7 Edge Plus/S6/S6 Edge/S5/S4/S3, Note 3/4
HTC One/One X/One S/M7/M8/M9/M10
Nexus 5/4, Nexus 5X
Lg G3, LG G4
Note: This device holder can hold devices within 2.1 to 3.1 inches in width. For bigger devices, please see TechMatte's full MagGrip line of car mounts.