Q: iPhone calls duplicated

Hi LavinaL,

Although your specifications show you have an iPhone 4S with iOS 7.0.4, it sounds like you have Continuity setup on your phones which allows phone calls to be shared between devices.

From Use Continuity to connect your iPhone, iPad, iPod touch, and Mac - Apple Support

Continuity features include Handoff, iPhone Cellular Calls, SMS, and Instant Hotspot. For example, you can start an email or document on your iPhone and pick up where you left off on your iPad. Or you can use your iPad or Mac to make and receive phone calls through your iPhone.

Further details in the article:

Set up iPhone Cellular Calls

• You need iOS 8 or later on your iOS devices and OS X Yosemite or later on your Mac.
• Check that you're signed in to iCloud with the same Apple ID on all of your devices.
• Use the same Wi-Fi network on all of your devices.
• Sign in to FaceTime with the same Apple ID on all of your devices. This means any device that shares your Apple ID will get your phone calls. If you don't want to receive calls on your other devices, learn what to do.

Make a call or answer a call

• To make a phone call on your Mac, find a contact's phone number in Contacts, Calendar, or Safari. Hover over the number and click the phone icon that appears to the right of the number.
• To make a phone call on your iPad or iPod touch, tap or click a phone number in Contacts, Calendar, or Safari.
• On your iPad or iPod touch, you can slide to answer a phone call. On your Mac, a notification appears when someone calls your iPhone. Then you can answer the call, send it to voicemail, or send the caller a message, right from your Mac.

Turn off iPhone Cellular Calls

To turn off iPhone cellular calls on your iPad or iPod touch, go to Settings > FaceTime and turn off iPhone Cellular Calls.

On your Mac, open the FaceTime app and go to FaceTime > Preferences. Click Settings and deselect the iPhone Cellular Calls option.

If that's not it, please let us know further details on your setup.