options: m : i see . call me when you get a signal . m : so you ca n't bring your cell phone because you 're going swimming ? m : you can only call me in the morning , and you ca n't call me in the evening because you have lectures ? m : so you ca n't call me because your phone is broken ?
article: m : i want you to call twice every day . once in the morning and once at night . f : i 'll take my phone for the drive up there . but we 're going camping in the mountains . my cell phone wo n't work there .