Here you will find frequently asked questions (FAQ) regarding the OpusTel App. If no answer is practical please contact us.

How do I get the app on my iPhone or Android phone?

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:

Can I have two numbers on my cell phone at the same time?

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.

How long does it take until I receive my ordered telephone number?

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

Why can't I or the person I'm talking to on the phone hear each other?

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.

Is the price the same as I pay when I get a call from someone who doesn't have OpusTel?

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


You can find the complete tariffs here:

How do I see my current balance?

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:

Do you also offer an Internet package?

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.

What is the advantage of an eSIM?

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.

How much does a share cost?

One share currently costs 3,300 Swiss Francs.

What is the advantage of a share?

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.

Would I recognize it if I was bugged?

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.

Where are the servers for the OpusTel solution located?

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.

Do I have additional charges with my mobile phone provider?

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.

Are you obliged to pass on conversations to the authorities?

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!

What are the advantages of both parties using the OpusTel app?

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

This gives you full privacy.

How much does it cost per minute to make a call via OpusTel?

Calls from OpusTel to OpusTel are free worldwide. To numbers from other providers in other countries according to our favorable rates:

How long are calls recorded by you as a customer stored in the OpusTel app?

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.

Is it possible to call with a suppressed number or does the number always light up?

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.

Is the balance of your OpusTel phone number sufficient?

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:

How do I get the best internet access worldwide on the best mobile data networks (3G, 4G and 5G)?

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: (the data allowance does not expire each month) (often the cheapest) (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.