Yes, 3G data works on iOS9 with my iPhone now. The cellular payload configuration file that I utilized is from the following link. But there should be more of those out there.
https://www.iijmio.jp/hdd/devices/iijmio-cellular.mobileconfig
Download the file on your computer. Then change the extension from "mobileconfig" to "txt".
Open it as a text file. Hit "Ctrl + F" (Command + F on Mac) and find "iijmio.jp" from the search field. Replace them all with "rogers-core-appl1.apn".
User name and password are not required for Speakout. So existing ones must be deleted. To do so, find where it says Username. You will see mio@iij in the next line. Replace the line with
Do the same thing for password. Find iij under Password, and change iij to .
Do other changes as necessary then save the file. Change the extension back to ""mobileconfig", and send it to your iPhone via email. Delete existing APN setting from you iPhone. Open the attahced file and install the configuration. That is it. You should be able to use 3G data.
I don't think this will cause anything fatal. But do this at your own risk. Hope this helps.