New Delhi, Dec 27 (ANI): A new mental agility test has suggested that iPhone users are smarter than those with other smartphones. A brainteaser by Ladbrokes found iPhone users answered seven questions in 94 seconds while those on Google Nexus phones were next on 99 seconds, the Daily Star reported. Blackberry owners were found to be the slowest, as they took an average 118 seconds to complete the test.