This paper proposes an adaptive speed-call list algorithm to predict and recommend phone numbers to call based on context. The algorithm was evaluated using call logs from 20 users and through a 3-month experience sampling method study with 10 users. The speed-call list was helpful for 80% of users, with the recommended number often being the one they wanted to call. However, some users complained about extra button clicks or delays required to access the list. The adaptive speed-call list was generally effective but could be improved with faster calculation and switching between recommendation and search/recents views.