Most Apple devices running iOS 9 can use Wi-Fi Assist to enhance a weak data connection by turning on cellular data automatically. Once iOS 9 is installed, Wi-Fi Assist is switched on by default.
Wi-Fi Assist is a feature added with the launch of iOS 9. The iPhone 5 and later can use Wi-Fi assist to stay connected to the Internet over slow or otherwise poor Wi-Fi connections.
The beta release of iOS 9 includes a Wi-Fi Calling feature specifically for AT&T Mobility customers. Until now, only T-Mobile and Sprint subscribers have had access to the service, which was added to iOS 8. According to MacRumors, AT&T has begun rolling out the service to a "limited number" of subscribers with iOS 9 installed on their iPhones.
Some iOS 8 users have reported Wi-Fi problems such as slow speeds and other performance issues. Developer Mario Ciabarra suspects the Wi-Fi inconsistencies are because Apple is "using Bonjour over AWDL" and "constraints" of the Wi-Fi hardware make this difficult. Click here to see Mario's detailed write-up on the issue.
The good news for those with jailbroken iOS 8 devices is Mario has released a tweak called WiFried to solve the problem. Once installed, WiFried provides a toggle in Control Center AirDrop settings. The toggle will disable AWDL (Apple Wireless Direct Link) support, allegedly improving Wi-Fi performance. Note that while AWDL is disabled, AirDrop will not be available.
Ever hear of AirDrop? Those who are used to file sharing with their newer Mac computer will find the term familiar. Now it seems Apple is prepared to equip its next generation iPhone with the technology. According to 9to5Mac, the OS X Lion adhoc file-sharing protocol is likely to be added to iOS 6.
This is all thanks to the Broadcom BCM4334 hardware that has been found in iOS 6 code. This chip uses a more efficient 40nm process, which is a step above the 65nm process found on chips in the iPhone 4S and iPad 3. When it comes to power, the new Wi-Fi chip reduces consumption by almost half, and increases standby time by three orders of magnitude.