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Simsme

The free Secure Instant Messenger by Deutsche Post — for confidential communication using your smartphone — on both Android and iOS.

Download on the AppStoreJetzt bei Google Play

SIMSme is the new Secure Instant Messenger by Deutsche Post AG. With more than 500 years of experience with the transmission of messages, Deutsche Post is the perfect partner when it comes to reliable and secure communication

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Simsme

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Highlights

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Encrypted Instant Messenger

SIMSme transmits your texts, images, videos, locations or contact data to your business partners immediately and completely secure using end-to-end encryption - entirely free of charge. No eavesdropping possible. Not even by us.

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Security

SIMSme makes the security of your communications its top priority. In addition to encryption and password protection, SIMSme also offers the possibility of checking your contacts via a QR code scanning process — so you can be sure of their identities. By the way: SIMSme uses your address book. You do not have to re-invite your contacts.

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Self-destruct feature

Especially important messages can be given an additional layer of security with the self-destruct feature. You can either set up a countdown so that your message can only be read for a certain amount of time or select an expiration date for the message. This will automatically make it disappear at the desired time. You therefore leave no traces on the web.

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FAQs

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Are my messages really secure?

All messages sent via SIMSme are always completely private and secure against eavesdropping (and will remain so) thanks to our end-to-end encryption system. Of course, this also includes your media, contacts and locations.

You can provide your messages with an additional layer of security by using the self-destruct feature. This causes messages to be automatically deleted from the recipient's device. Please also see the section entitled "How do self-destructing messages work?".

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How does SIMSme's end-to-end encryption work?

All message sent via SIMSme are symmetrically encrypted on your phone using AES-256 and transmitted to the recipient via the SIMSme servers using SSL encryption. Your recipient needs the proper key in order to read the messages.

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How do self-destructing messages work?

To send a message using the self-destruct function, you first have to write a chat message as usual (or attach a file, contact or location, depending on what you would like to communicate). After that is done, you have to "arm the detonator" by clicking on the bomb symbol to the left of the text input field.

You can now select between a countdown and a specific "self-destruction time".

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How does SIMSme's "Trust Status" system work?

You can see how sure you can be of your contact's identity based on the colour coding of your SIMSme contacts.

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Why does SIMSme require access to my contacts?

In order to connect to your existing contacts using SIMSme, we have to compare your phone/address book to our user list in a hashed manner. Of course, this process is also entirely encrypted. Naturally, your phone/address book will not be stored on our servers.

Using this approach, we can connect you to your contacts without the need to request every single one of your phone/address book contacts again within SIMSme.

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Why does SIMSme require access to Push Notifications?

SIMSme requires access to Push Notifications in order to actively inform you of new messages. If you did not grant SIMSme access to Push Notifications, you have to actively retrieve your messages from our server by dragging the chat overview downwards.

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What can I do if I forget my password?

The password is an important security anchor of SIMSme's privacy concept and is only stored locally on your phone.

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How do I delete my account?

You can delete your account via "Settings" → "Profile".

For security reasons, you will be prompted to enter your password and telephone number. Please note that all data, media and the chat history will be irretrievably lost if you delete your account.

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Simsme

The free Secure Instant Messenger by Deutsche Post — for confidential communication using your smartphone — on both Android and iOS.

Download on the AppStoreJetzt bei Google Play