How Does OpusTel Work?

OpusTel enables the use of a Swiss landline number via the OpusTel app on a smartphone. Calls are made over an internet connection, for example via Wi-Fi or mobile data.

This allows the Swiss landline number to be used while on the go and abroad, without incurring traditional international roaming charges for OpusTel telephony.

Calls can also be made to regular phone numbers on the public telephone network. Therefore, the person you are calling does not necessarily need to have the OpusTel app.

Encrypted Telephony

OpusTel uses SIPS, SRTP, and TLS, among other technologies, for secure communication. For calls between two OpusTel apps, communication is end-to-end encrypted.

This distinguishes OpusTel from conventional mobile and landline telephony and provides a telephony solution focused on privacy and secure communication.

OpusTel combines several features that are usually found across different solutions:

• Swiss provider
• Swiss landline number
• Smartphone app
• iOS and Android
• Encrypted telephony
• Calls via Wi-Fi and mobile data
• Usable worldwide
• No roaming charges for OpusTel telephony
• Calls to regular phone numbers
• No OpusTel app required for the person you are calling when calling the public telephone network
• Swiss servers
• End-to-end encryption for OpusTel app-to-OpusTel app communication

In short: OpusTel is a Swiss telephony app that allows you to use a Swiss landline number on your smartphone. Calls work via Wi-Fi or mobile data, the service can be used worldwide, and it supports encrypted communication as well as calls to regular phone numbers.

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The app can be found in the Apple App Store and in the Google Play Store under OpusTel. In the second step, you can obtain a telephone number from us. There are good international swiss numbers available for all members of the earth. The first ones get the best phone numbers. You can also port your landline number to us. We will deliver the access data within 24 hours. After that, the app is ready to use. You can register a phone number here, which will be activated within 24 hours and delivered by e-mail: https://www.opustel.ch/en/order

Yes, the first number is registered via QR-code on the OpusTel app and the second number is registered on the Cloud Softphone app via QR-code. This means you can be reached via two additional phone numbers.

Delivery of your order can take up to 24 hours. In most cases, the number should be delivered on the same day.

It is possible that you did not allow the microphone at the start of the OpusTel app installation.

Go to the settings of your smartphone and search for OpusTel, where you can allow access to the microphone.

If it still does not work, you can uninstall the OpusTel app and then install it again.

Important: Allow access to the microphone during installation.

Incoming calls to the OpusTel app phone number are always free worldwide!

You can find the complete tariffs here: https://www.opustel.ch/en/opustel/international-rates

You will receive the login for your personal WEB-Admin telephone account when you receive the number you ordered. As soon as you have logged in, you will see your current balance in the top right-hand corner.

You will also receive an e-mail if your balance falls below Swiss Francs 5.

You can top up your account here: https://www.opustel.ch/en/recharge

Yes, we recommend the eSIM solution from KeepGo for cell phones. This allows you to make much cheaper calls abroad without roaming costs. If you order the data volume through us, we will take care of topping it up in good time and send you the amount with your monthly bill.

With an eSIM, you are always automatically connected to the best network in the country.

In addition, an eSIM is much cheaper, the configuration of an eSIM takes less time and with the QR code the configuration is easier.

We automatically top up your data allowance with your monthly bill. Furthermore, your data allowance does not expire with our solution.

One share currently costs 2,600 Swiss Francs.

You can make free, worldwide and encrypted calls to one of our telephone numbers.

For at least three years (in practice as long as you own a share). The extension is subject to a resolution by the Annual General Meeting.

Yes, during a call you will see a golden lock at the top right.

If the lock is open, this means that the line is no longer secure.

The servers used by OpusTel are located at several sites in Switzerland.

The connection between the OpusTel app on your cell phone and our servers is always authenticated and encrypted.

This is done with SIPS, SRTP, TLS and a 256-bit certificate from SwissSign.

No, there are no call charges for the mobile number or the other mobile provider. At most, there is a charge for using the Internet.

We recommend WLAN or global mobile data providers for Internet access so that no roaming costs are incurred worldwide. You can contact us for optimal global mobile data access.

No, because we are not obliged to record the calls.

Your calls are encrypted and the authorities would only hear static noice if they were monitored.

We do not record calls!

This guarantees that no call costs are incurred worldwide and the call content is encrypted end to end.

This gives you full privacy.

Calls from OpusTel to OpusTel are free worldwide. To numbers from other providers in other countries according to our favorable rates: https://www.opustel.ch/en/opustel/international-rates

The call content is encrypted and is not recorded by us or other telephone companies as it only contains noise. Noise is caused by encryption. If you record the call yourself on your phone, it is unencrypted and you can delete it yourself.

We do not recommend suppressing the telephone number, as many telephone companies are increasingly combating this and using filters to prevent such calls. We can suppress the telephone number at the customer's request.

It is worth topping up the balance to over CHF 100. OpusTel pays 3% interest for the whole year if your balance exceeds CHF 100.00 once a year.

You can top up your phone balance here with bank details, TWINT, credit card or Bitcoins: https://www.opustel.ch/en/recharge

If your cell phone has an eSIM, this can be done online in just a few minutes. We recommend that you do this before you travel, as it requires a good Internet connection and a credit card. The following links will take you there:

https://www.keepgo.com (the data allowance does not expire each month)

https://esim.holafly.com/de/ (often the cheapest)

https://www.gigsky.com (often the fastest)

Or you can write us the destinations and the model of your cell phone and we will advise you and provide you with everything you need.

We recommend the following steps:

1. Set up call forwarding to your OpusTel number:
   To forward calls, enter on your phone *21*destinationnumber# (Example: *21*004144.......# (Your OpusTel number)) and press the call button.
   You will hear a confirmation message – after that, you can hang up.

2. Deactivate the SIM card:
   Go to Settings > Mobile Data and deactivate the SIM card.