Remind me to post the letter

Everything on one screen: how often this usually needs to happen, the free way to set it on the iPhone you already own, and what changes if a phone call does it instead.

The reminder post the letter

One-off — a single date and time. The free built-in option comes first below, because for plenty of people it is genuinely the whole answer.

How often: one-off

One-off reminders carry the most risk per alert: there is no second chance next week and no habit to catch you if the single notification lands at a bad moment.

Why this one slips: The envelope is written, sealed and then carried around for a fortnight, because posting it needs you to be walking past a postbox and thinking about it at the same time.

Free first: the Reminders app you already have

  1. Open the Reminders app and tap New Reminder.
  2. Type “post the letter” as the title.
  3. Tap the ⓘ details button, switch on Date and Time, and set the time.
  4. Set Repeat to no repeat — just the date and time.

This is free, already on your phone, and for a lot of people it is genuinely enough — try it for a fortnight before paying anyone, including us. Its limit is that it ends in a notification: it is not exempt from Do Not Disturb the way a Clock alarm is, and a banner can be cleared without being read. If the timing is the hard part, set a repeating Clock alarm instead — iOS lets alarms sound even on a muted phone.

A silent banner still loses here: the alert fires at home, and the postbox is the only place it would have been useful.

What a call changes

With ReminderCall your phone rings like a normal incoming call — a real call over the phone network, not a banner and not an in-app alarm. You answer, and a voice reads the reminder out loud in the words you wrote. Answering is an action, which is harder to do absent-mindedly than clearing a notification.

To be precise about it: a call follows your ring settings rather than your notification settings. On hard mute it vibrates and takes over your screen instead of ringing out loud, unless you save the number as a contact with Emergency Bypass switched on yourself.

Why “post the letter” is the one that slips

The envelope is written, sealed and then carried around for a fortnight, because posting it needs you to be walking past a postbox and thinking about it at the same time.

Deadlines, renewals and paperwork that nobody else is going to chase you about. The failure is almost never that you did not know — it is that the prompt arrived at a moment when acknowledging it was easier than acting on it. One-off reminders carry the most risk per alert: there is no second chance next week and no habit to catch you if the single notification lands at a bad moment.

Read next: an app that calls instead of sending notifications · reminders when your phone is on silent · is it a real call or a notification?

Free first: Reminders, not us

  1. Open the Reminders app and tap New Reminder.
  2. Type “post the letter” as the title.
  3. Tap the ⓘ details button, switch on Date and Time, and set the time.
  4. Set Repeat to no repeat — just the date and time.

This is free, already on your phone, and for a lot of people it is genuinely enough — try it for a fortnight before paying anyone, including us. Its limit is that it ends in a notification: it is not exempt from Do Not Disturb the way a Clock alarm is, and a banner can be cleared without being read. If the timing is the hard part, set a repeating Clock alarm instead — iOS lets alarms sound even on a muted phone.

The other free move, and often the more effective one: anchor it to something you already do without thinking — after the kettle goes on, before you lock the front door, as you sit down at your desk. A reminder attached to an existing habit needs far less from your phone. Try both for a fortnight before you pay anybody for this.

How a call for “post the letter” works in ReminderCall

  1. Write it in your words. “Post the letter — now, before you sit down.” Not a generic beep, and not a title you will scroll past.
  2. Set the time and the repeat. One-off is the usual rhythm for this one, and you can pick once, daily, weekdays, weekly or monthly instead.
  3. Your phone rings. You answer and the reminder is read out loud. Miss it, and the same words arrive as a text.

Honest caveats

Get a call to post the letter

Set the time, write the words, and your phone rings. Free to download — and genuinely, try the Reminders app first if you have not.

4.6 on the App Store · free to download

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