Short answer: yes. You can share one M1 number and inbox with your team using Shared Line.
If you need several numbers under one account, use Multiple Lines.
1. Two ways teams use M1
Shared Line plan: one phone number, one account holder, plus invited members who all share the same inbox. Everyone can answer calls and reply to messages from that single number.
Multiple Lines plan: several phone numbers under one account holder. No invited members (yet). The account holder manages and uses all numbers.
💡 Choosing a plan
Want your whole team on one shared number with shared visibility and replies? Pick Shared Line.
Need separate numbers (for people, departments, or use cases) but managed by one owner? Pick Multiple Lines.
2. How to upgrade to the Shared Line plan
Switching from the Single Line plan to the Shared Line plan is simple:
Open your M1 app
Go to the Settings tab
Tap Invite Members
Choose the Shared Line plan (available Monthly or Yearly)
📲 If you don't see "Invite Members" make sure your app is up to date.
ℹ️ When you switch from Single Line to Shared Line, Apple will charge you the full price for the new subscription. Don't worry - they'll automatically refund the unused portion of your Single Line subscription.
You won't have two active subscriptions at once, and you won't pay twice.
The Shared Line plan includes all the features from the Single Line plan, plus shared access.
Learn more about switching plans here.📖
3. How to invite your team to your inbox
After upgrading to the Shared Line plan, invite your collaborators:
In Settings, tap Invite Members to share your 6-digit invite code via text, email, or your preferred method
Your teammates download the M1 app from the link provided
From the Home screen, they tap Join a Team, enter the code, and follow the steps to connect
✅ Once joined, they'll have full access to your shared inbox.
ℹ️ You can invite unlimited members to your inbox
⚠️ If a team member switches devices, the inbox owner must re-invite them to reconnect.
4. What can your teammates see
Your teammates will see everything that's visible in your M1 inbox - including call summaries, voicemails, voice memos, and text conversations.
As soon as they join your inbox, they'll have access to your entire M1 history, not just messages or calls received after they joined.
Only your saved contact list remains private. Even if you've allowed M1 to access your iPhone contacts, your teammates won't be able to see them. However, they will see phone numbers of people you've called or messaged through M1, to help with collaboration - without exposing your full contact list.
In short: everything visible in your M1 inbox is also visible to your team - except for your contact list.
⚠️ There's currently no way to hide specific messages or calls from your team
ℹ️ If you forward an external number to M1 (like your business number), only calls are redirected and logged in M1. Texts sent or received on that number - outside of M1 - will not appear in your inbox or be visible to your team.
5. FAQ
Can my teammates make calls and send messages from the shared number?
Yes. Anyone you've invited to the Shared Line can make and receive calls, listen to voicemails, and send and receive messages - all using the shared M1 number.
How are incoming calls directed to my team?
When someone calls your shared M1 number, the call rings on all team members’ devices at the same time. Any teammate can answer. Once the call ends, everyone will receive the call note and summary to stay aligned and keep context.
Can my team handle multiple calls simultaneously?
Yes, all from the same number. No missed opportunities - just seamless teamwork.
Who gets notified when a new call or message comes in?
Everyone who has access to the Shared Line will receive the same notifications for new calls, messages, voicemails, and call summaries.
Can I control who replies to what?
Not at this time. All teammates have equal access and visibility into messages and calls. There are no roles or permissions yet.
Can I use different voicemail greetings per teammate?
No. The Shared Line uses one shared voicemail greeting for all callers.
Will my teammates see my past messages and calls?
Yes. Once they join your inbox, your teammates will have access to your entire M1 history - not just messages or calls received after they joined.
Can my teammates see my contact list?
No. Your saved contact list remains private. Even if you've allowed M1 to access your iPhone contacts, your teammates will only see phone numbers of people you've called or messaged through M1.
Can I hide specific calls or messages from my team?
No. There's currently no way to hide specific messages or calls from your team. If it's in your M1 inbox, it's visible to your invited members.
What happens if I forward another number to M1?
Only calls are redirected and logged in M1. Texts sent or received on that number - outside of M1 - will not appear in your inbox or be visible to your team.
How many teammates can I invite to join my inbox?
You can invite unlimited teammates to your inbox with the Shared Line plan. There's no cap on how many people can collaborate with you.
Can I remove someone from the Shared Line?
Yes. You can remove team members at any time. Once removed, they'll no longer have access to your inbox history or future conversations.
Can I switch back to the Single Line plan later?
Yes. You can downgrade to the Single Line plan at any time from your Settings. Just note that your team members will immediately lose access to your inbox when you do.
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