HI @Tumatawhero.
Thanks for your post and welcome to the Community!
Great to hear that you transferred back to AGL, you will receive a letter from us indicating when the digital meter will be installed. This should be completed by the end of April 2017. If you need any extra information about this, we suggest that you should call our digital metering team on 1300 669 245.
You can still download the AGL App at any time and register your AGL account and once the digital meter your App will update within 10 business days post meter exchange with your electricity consumption.
Thanks!