I Phone 4S. I am unable to update the software. Evidently my I Mac ( 10.4) will not allow or support the sw update. How can I update  this device? The phone function is not currently working either. HELP ! at t

I am unable to update my I Phone 4s through I-Tunes. I believe its due to my antiquated  10.4 operating system on my 2005 I Mac. How can I perform the software update. Currently even the phone function will not work . I'm a novice with this device.

Whatever version of Leopard you purchase, I suggest updating it to 10.5.8 which should have everything you require. To update Leopard download and install Mac OS X 10.5.8 Combo Update. Alternatively, open Software Update and install all the recommended updates. That will include the above updater.
To update your phone:
Upgrading iOS
   1. How to update your iPhone, iPad, or iPod Touch
   2. iPhone Support
   3. iPod Touch Support
   4. iPad Support
     a. Updating Your iOS to Version 6.0.x from iOS 5
          Tap Settings > General > Software Update
     If an update is available there will be an active Update button. If you are current,
     then you will see a gray screen with a message saying your are up to date.
     b. If you are still using iOS 4 — Updating your device to iOS 5 or later.
     c. Resolving update problems
        1. iOS - Unable to update or restore
        2. iOS- Resolving update and restore alert messages

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