Salesforce1 is available for most Salesforce editions and user license types. The app is supported on a variety of mobile platforms, with some minimum operating system and mobile browser requirements.
Salesforce performs automated and manual testing of the Salesforce1 downloadable and mobile browser apps on a select set of mobile devices. Customers aren’t blocked from using Salesforce1 on untested devices as long as they meet current platform requirements. The list of Salesforce1-tested devices is subject to change, with or without advance notice.