Lol, Come on supporting VoLTE if Rogers didn't support this it would be the slowest LTE network in the whole world
Just so you know smartphone used to need at least two channels one for talking and one for Data, before 2010 peoples were consuming more voice than data, after 2010 it all changed and people were consuming more data than voice so carriers transfered the voice channel on data Voice over IP and used both channels for data that is why back in 2011 we began to see faster network (double the previous speed because of the 2 data channels) this way they can benefit from the old voice channel that wasn't used anymore.
Rogers need to update there networks after sitting on their Laurels for so long, it needs to support eSim and also needs to be able to support 2 devices on a single phone number.
Traditional cellular network only rings a single cellular tower when someone calls you (the last tower your phone sync with) but with the Apple Watch series3 it might needs to rings on two towers if you're not carrying both devices and Rogers network can't do that, so you will for sure miss some calls unless you always carry both devices. Rogers has invest so much money into getting the NHL exclusive rights and so much money into try to compete Netflix with Shomi (poorly failed), Rogers fidelity points « first Rewards » point (even more failed) that they forgot all about their main business (telecommunication). Thanks to the Vancouver winter Olympics in 2010, Bell and Telus drop their CDMA networks to replace them with GSM networks (to be able to offer tourists a carrier solution into Canada) and they are regularly upgrading their networks as oppose to Rogers which is the main reason both Rogers and Telus will be before years end 2017 supporting the Apple Watch series 3 while Rogers won't be able before 2nd or 3rd trimester of 2018, if they decide rapidly to support the Apple Watch series3 or wait for the series 4 if they don't have the money because loosing to much customers to Bell and Telus.
