iOS 9 will allow you to use Continuity with your Mac over the mobile network without resorting to a Wi-Fi connection

We have already spoken at length more than once about this feature that arrived last year with OS X Yosemite and iOS 8 and that it allowed us to continue working or doing any type of task between the different synchronized devices through a Wi-Fi connection, that is, if for example we were writing an email on our iPhone and we wanted to continue right where we left it on our Mac, it was enough with pressing an icon that appeared on the Mac screen to continue right at that point that we had left on the iPhone, undoubtedly a great advance in terms of productivity.

However, for this to work, we had to have a Wi-Fi network active between the different computers to communicate, now the need to be on the same Wi-Fi network to use Continuity not a requirement, it appears that users will be able to make and receive calls as well as messages through a connection to the mobile network in iOS 9.

The only requirement is that it will be necessary for operators to support this type of technology, for example T-Mobile has already confirmed that it would be currently working with its network to adapt this feature in iOS 9 beta:

One of the requirements for using continuity is that both devices must be on the same Wi-Fi network. With iOS 9, this is going to change and T-Mobile wants the world to know that it is the first of the major carriers in the United States to offer continuity over its mobile network. Your iPhone won't need to be on any Wi-Fi network to pass calls and text conversations to your Mac or iPad, although obviously the latter two devices still have to be online for this to work.

Undoubtedly great news since you just have to imagine that for example you are not at home, but that you have your Mac turned on and at that moment you are writing in some mail and you realize that you need to attach a file to that email that you do not have at the moment in the cloud or on the iPhone, at be able to have continuity On the mobile network, you can ask someone at home to attach the file to the email that you have half finished and send it ... matter resolved. If this feature arrives well polished for me it will be one of the most striking improvements in iOS 9.