Connect or sync iPhone with iTunes over Wi-Fi without cable (USB Lighting cable) running on iOS 8, iOS 7, iOS 9. Without any third party software, External Third party device you can do it officially by option available in iTunes. One time setting helps any time after that for connect your smart iOS device remotely over the air with Wi-Fi enabled PC/ Mac (MacBook, MacBook Air, MacBook Pro). Then you can transfer or sync Songs, Videos, TV Shows, Photos, Movies, Apps Through iTunes to iOS device without USB lighting cable.
For that you have to enable settings for access your iOS device over the Wi-Fi for Sync only from iTunes.
Useful: How to fix iTunes corrupt backup for iPhone, iPad.
Steps for sync iPhone with iTunes over Wi-Fi without Cable: iPad, iPod Touch
First time you have to USB lighting cable for temporary connection and reserve your device able for access over Wi-Fi, So just connect your iPhone with your PC/ Mac (iTunes installed)
Your Both Devices must be connected with same Wi-Fi network
You can apply this way on iPhone 4S/4, iPhone 5S/ 5, iPhone 6, iPhone 6 plus and iPad/ iPod touch running on iOS 8/ iOS 7 and iOS 9.
Step 1: Launch iTunes on your PC/ Mac (Wi-Fi enabled)
Step 3: From the right pane, choose device summery.
Step 5: Next, Click on Apple for save changes.
Now you don’t need USB lighting cable for sync iTunes over the Air.
Here in below screen, whenever HIS-PC detect with available update on iTunes, Sync Now will be highlighted in blue otherwise it will be disabled.
This working perfectly, May be in your case you have to wait for some time due to low internet speed or Wi-Fi connection problem.
If you can’t sync iPhone with iTunes over Wi-Fi without Cable, Check your iPhone or PC connected with same Wi-Fi name. Many times I Faced problem on iPhone can’t sync on Wi-Fi and Solved by adjusting Wi-Fi network.