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Welcome!
This manual helps you to optimise the usage of 1&1 Business Phone App for MS Teams.
We hope you enjoy working with 1&1 Business Phone!
Subject to alterations
Version 2 / 09/2025 (EN)
| Type | Icon/Character | Description |
| NOTE
CAUTION
WARNING |  | NOTE: Information that is useful but not critical to the reader.
CAUTION: Tells the reader to proceed with caution.
WARNING: Stronger than CAUTION; means "don't do this" or that this step could be irreversible, e.g., result in permanent data loss. |
| TIP |
| Useful tips that provide additional information. |
| Procedure | 1. 2. 3. | Procedures are numbered steps to perform an action, where the order of the steps is relevant. |
| Result of procedure/action | ⇒ | Indicates the result of an action//procedure. |
| Lists | • • | Used for listings and items where the order of steps is irrelevant. |
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There are two options to install the app.
The first one is done by the administrator in your company. The administrator rolls out the app for every user in the MS Teams environment.
This is the recommended way and it has already been documented by Microsoft, see https://learn.microsoft.com/en-us/microsoftteams/teams-app-setup-policies#install-apps.
The second option is that the user installs the app on their own via the MS Teams App Store.
1. in the MS Teams navigation bar, go to Apps.
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2. In the search box, search for 1&1 Business Phone.
3. Click on the 1&1 Business Phone app box.
⇒ A new dialogue will open.
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4. In this dialogue, click on Add.
⇒ The app will be added to your personal apps and will open afterwards.
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5. Right-click on the 1&1 Business Phone icon in the navigation bar on the left and click on Pin.
6. To use the app, click on Sign in and log in with your app user credentials.
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To use the app from the MS Teams, make sure that the Desktop App or the Web App is runing in the background and the user is logged in.
When the user starts a phone call, the call will open in a small floating window in the top-right corner of the app. Here you can:
mute yourself
put the call on hold or
end the call.
After the call has been ended, the small window will disappear.
Apart from that, there is not much difference to the 1&1 Business Phone app.
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Keep in mind that some features are not available in the 1&1 Business Phone App for MS Teams (e.g. Call forwarding, Fax or Shortcuts). To use these functions, open the Desktop app that is running in the background.