Moved to Forum: Original Link
Use your Optus number to Call/Text via WiFi! First for any telco in Australia.
According to the app description:
Make and receive calls+texts using any WiFi with this app. It works even with no Celluar connection when using wifi. You use your Optus number, and the recipient doesn't know the difference. You can call all numbers, mobile/landline and international which are charged to your mobile bill as part of inclusions on your plan. Works with postpaid, prepaid, and business plans.
Great for me because I live in a place with limited reception. It worked when I tried it last night; I put my phone on airplane mode and turned on wifi. Could call my mate living in Sydney. At least I can still call/text without paying a premium for Telstra in my area. It doesn't work overseas or with Optus MNVOs like Vaya, Amaysim, etc. from what I've tried.
Don't know whether this is a deal, but it seems like it for me. If it isn't mods feel free to move to forums.
Does it have to be wifi? What if I have somehow ended up with a ton of telstra 4g data. Can I just put that sim in my phone and use the data connection to make calls from my Optus mobile number?
Edit: is this also valid for prepaid customers?