Twinbox.
How it works Features Get started Google Play
Call & message blocker

Block unwanted SMS & Calls.
On your terms.

Take control of who can reach you. Block calls and text messages from selected contacts — until you unblock them, for a few hours, or on a weekly schedule.

Your quiet hours. Your chosen contacts. Your rules.

Get it on Google Play ▶ Call & SMS Blocker ▶ SMS Safebox
✓ Free ✓ Permanent or scheduled ✓ Calls + SMS
9:415G ▪ 84%
Interactive preview

Call & message
blocking

Choose when someone can reach you.

A
AlexSelected contact
Calls & texts blocked

No ring. No notification.

Call blocking requires call screening.

0
try 1 2 3 4 = to open
Inbox· securelock ✕
Inbox
Safebox
Bin
KA
Kanya
see you at 7? 🙂
09:41
2
BB
Bangkok Bank
OTP 48213
09:12
PL
Ploy
moved to Safebox ✓
08:50
GR
Grab
driver 3 min away
MON
NK
Nok
555 okay 😂
SUN
See Twinbox in action

Two ways to take control.

Call & SMS Blocker

Block selected contacts permanently, temporarily, or on a schedule.

Watch on YouTube ↗

SMS Safebox

Keep personal messages private with PIN or biometric access and a calculator disguise.

Watch on YouTube ↗
The disguise

It looks like a calculator. It is a calculator.

Anyone who opens Twinbox sees a fully working calculator — nothing hints there's more. Type your secret code and press =, and your real messenger appears. Lock it again and it's just a calculator once more.

What's inside

Your calls. Your messages.
Your rules.

Control who can reach you, and keep personal messages private.

Control

Call & message blocking

Block selected contacts continuously, temporarily, or on the days and times you choose.

See blocking options
Until you unblockKeep a contact blocked until you turn it off.
For a set timeChoose 1 hour, 8 hours, 1 day or 1 week. Unblocks automatically.
On a scheduleChoose the days and times. Blocking switches on and off automatically.
Twinbox blocking options: continuous, temporary and scheduled blocking

Call blocking requires call screening to be enabled.

Decoy

Calculator decoy

A real, usable calculator on the outside. The messenger opens only with your private code — invisible to anyone holding your phone.

Vault

Safebox

Move any conversation into a vault locked by PIN and fingerprint or face. Private threads stay hidden until you unlock them.

Bin

Smart Bin

Send a sender to the Bin and their future messages auto-sort there — your inbox stays clean and free of spam.

Local

Stays on your phone

It's your regular SMS/MMS app — messages live on your device, protected behind the decoy and your lock.

Simple to set up

Block in four simple steps

01

Choose a contact

Select the contact or number you want to block.

02

Choose how long

Keep them blocked until you unblock them, or choose a temporary block.

03

Set your schedule

For recurring quiet hours, choose the days and start and end times.

04

Stay in control

Change your blocking settings or unblock a contact whenever you choose.

Free on Android

Take back your quiet

Get a free call and message blocker with flexible schedules and a private inbox.

Get it on Google Play