Sign in with Microsoft
Sign in or create an account.
Select a different account.
You have multiple accounts
Choose the account you want to sign in with.

Use options to specify calls and meetings, contact options, and other overall settings. Depending on how your organization has set up Lync, some of these options might be turned off. Contact your technical support team for more information.

Note:  This article applies to Microsoft 365 operated by 21Vianet in China.

In this article

Calls and meetings

Phone Number

Enter your iPhone’s mobile number with country/region codes. When Lync cannot use Wi-Fi or the cellular data network to make an audio or video call, you’re called back at this number to connect you to the audio part of the Lync call.

When you first sign in to Lync for iPhone, you’ll be guided to configure your Phone Number. To update it, do the following:

  1. Tap My Info, and then tap Options.

  2. On the Options screen, under Calls and Meetings, tap Phone Number, and then enter your mobile phone number including the country/region and area code.

Require Wi-Fi for VoIP, Voice, Content

For more information, go to Adjust your data use settings.

My Credentials

By default, the My Credentials option is turned on so all your meeting and voice mail information is shown on Lync.

The Exchange setting lets you enter credentials if Exchange credentials are separate from your Lync settings. If they’re the same, keep the Use Lync Credentials switch set to ON. You need Exchange credentials to show meetings and voice mail

HTTP Proxy settings are needed if your corporate network has a proxy that requires credentials setup. You’ll need to enter this information to sign in and use the application on your corporate Wi-Fi.


To show or hide pictures of your contacts, tap ON or OFF.

When this option is turned off, pictures aren’t downloaded or displayed.



Text telephone (TTY) mode is used to send text over a telephone line. A TTY device must be connected to the iPhone to interpret the modified audio. Otherwise you might experience poor audio quality. Using TTY mode in a conference call might also cause audio quality issues.

By default, TTY mode is turned off. Tap ON to turn it on.


When you turn on your phone’s Zoom option, you can use gestures to enlarge any page you're viewing, including Lync pages.

1.       In the App list, tap Settings > General > Accessibility > Zoom.

2.       Turn Zoom on.

3.       On any screen you want to magnify, do the following:

  • To zoom in, double-tap with three fingers.

  • To change the magnification, use two fingers to double-tap and hold, then drag your fingers up or down to increase or decrease magnification. Stop when you reach the magnification level you want.

  • To restore the screen to its original, unmagnified display, double-tap with three fingers again.

Help and About

Tap Help to view Help topics and videos.

To view version information, terms of use, and privacy statement, do the following:

  1. Tap My Info, and then tap Options.

  2. On the Options screen, under Other, tap About.

Top of Page

Need more help?

Want more options?

Explore subscription benefits, browse training courses, learn how to secure your device, and more.

Communities help you ask and answer questions, give feedback, and hear from experts with rich knowledge.

Was this information helpful?

What affected your experience?
By pressing submit, your feedback will be used to improve Microsoft products and services. Your IT admin will be able to collect this data. Privacy Statement.

Thank you for your feedback!