10.6084/m9.figshare.5146753.v1 Panagiotis Andriotis Panagiotis Andriotis New draft item figshare 2017 Android, Authorization, Authentication, Smart-phone, GPRS, GPS. Mobile Technologies 2017-06-27 07:30:11 Journal contribution https://figshare.com/articles/journal_contribution/New_draft_item/5146753 A call for participants to our user study.