SIM Shift: a schedule per SIM

Massimo Greco

About this app

Work number and personal number on the same phone? With SIM Shift you decide when each of them can ring. Work goes quiet in the evening and at weekends, your personal number stays reachable. No more office calls at dinner.

SIM Shift looks at every incoming call, works out which SIM it is coming in on and applies your rules in an instant: it lets it ring, silences it or rejects it.

Only one SIM? SIM Shift works that way too: it is a call filter with block and allow lists, by prefix too, and with schedules if you need them.

■ A SCHEDULE FOR EACH SIM
• Time slots day by day, more than one a day and even across midnight.
• Ready-made shortcuts: «Mon–Fri 8–18» with one tap, or copy Monday to the other days.
• Out of hours you choose what happens: Silence (the call stays among your missed calls, so you can call back) or Reject.
• Works with physical SIMs and eSIMs, even if you move them to another slot.

■ BLOCK AND ALLOW LISTS, SHARED OR PER SIM
• Block list: that number never rings, not even within hours.
• Allow list: that number always gets through, even if it is not in your contacts.
• By exact number or by prefix: block a whole country (for example +49) and let through only the people you know.
• Find the prefix by country: tick several countries at once, or «Select all». The list reads «+358 Finland», not just the number.
• Each entry applies to all SIMs or to just one.

■ NUMBERS YOU DON'T KNOW
For each SIM you can silence or reject callers who are not in your contacts: always, or only out of hours.

■ AT A GLANCE
The main screen shows a sign for each SIM, like a road sign. Red with a bar: it is being filtered right now. Blue: it rings right now. Below you see the week's schedule and today's bar with a «now» mark. When a SIM is quiet, SIM Shift tells you when it will ring again.

■ LOG OF FILTERED CALLS
• Every stopped call, day by day, split by SIM, with the reason: out of hours, block list, not in contacts.
• If the caller is in your contacts you see their name.
• A badge tells you how many calls were filtered today.
• From any row of the log you put the number on the allow or block list with one tap.

■ BACKUP OF YOUR DATA
• SIM Shift can save a copy of schedules, lists, log and settings by itself every time you close it, in the folder you choose.
• You can also save, share or restore the backup by hand: change phone and find everything again.

■ YOUR PRIVACY, FOR REAL
• SIM Shift has no Internet access: it cannot send anything to anyone, not even if it wanted to.
• No account, no sign-up, no ads.
• Contacts, lists and log stay only on your phone.
• It uses only two permissions, and explains what they are for before asking: Phone (to know which SIM a call comes in on) and Contacts (to recognise who is in your contacts).

■ HOW IT WORKS
SIM Shift uses Android's official way of filtering calls: the «Caller ID & spam app» role. At first launch it asks you for it and guides you step by step. Only one app at a time can hold it on a phone: if the Phone app's spam filter has it now, switch it to SIM Shift.

■ GOOD TO KNOW BEFORE INSTALLING
• Android does not pass calls from hidden numbers to filter apps: SIM Shift cannot stop those. You can block them yourself in the Phone app's settings, and SIM Shift takes you there.
• Out of hours nobody rings, not even numbers on the allow list: that is the rule that keeps your evenings free.
• Requires Android 12 or later.

Light or dark theme, in English, Italian and French, no subscription.

SIM Shift: it rings when you say so.

What’s new

• Bottom bar: each icon now has its name underneath.
• The + is on every tab: outside Lists it opens a new block list entry.
• Log: for a contact, name, number and reason sit on three separate lines.
• Cleaner Settings, same SIM tag in Lists and Log, slightly larger small text.