Q: My iPhone 6plus calls and texts on it,s own

Hi Susyreed, 

Thanks for using the Apple Support Communities. It appears that your iPhone 6 Plus is making calls and texts to your contact list without you initiating them. I use my iPhone all the time and I'd be concerned as well. I'll be happy to help you with this. The first thing that I'd recommend is for you to create a backup of the iPhone. 

How to back up your iPhone, iPad, and iPod touch

Import photos and videos from your iPhone, iPad, or iPod touch

After making sure that you have a current back up, please then restart the iPhone and see if that resolves your issue.

Restart your iPhone, iPad, or iPod touch

If you are still experiencing the issue with the unexpected calling or texts, please use iTunes on your Mac or PC to restore your iPhone, iPad, or iPod to factory settings and set up as a new device. Once set up as new, test it out again to see if the issue is resolved. Then restore from a backup. 

Restore your iPhone, iPad, or iPod touch from a backup

Have a great day! 

Thanks for following up, Susyreed. If the iPhone is still making unexpected calls and texts on it's own, when it was restored to factory new, then you would want to have it seen by an Apple Retail Store or an Apple Authorized Service Provider for further testing.

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Cheers!