In App Purchase Error, ( Transaction Failed Cannot connect to iTunes Store)

Although you may be using the same iTunes Account, things can get a little strange if you have different AppleID's for each device. On your device, check settings ==> Store. The AppleID for that device is listed there. It can be confusing because syncing to the same iTunes account is not the same as managing App and purchases through the iTunes Store Account.

On your iTunes window the uppe right corner shows which AppleStore ID is logged in. If it turns out they are different, simply log out of the store on iTunes, and log in with the other account. Download the updates. Log out and then back in to the other account.

As an alternative, download the updates on the device they were purchased. Sync to iTunes, and the updated download be transferred back to iTunes and available to the other devices syncing with iTunes.

Or....... if your iPhone is Airplane Mode, turn that Airplane mode off and ignore everything from above.