Dear Emir,
In India Networks and Phones are unlocked. Network provider (Reliance Jio) does not add or remove any Phone model to work in their network nor provide support for any specific model. It supports all LTE phones for using Internet and all Volte enabled phones for Voice calls.
Xperia M4 aqua Supports only LTE but not Volte. For some God known reasons Sony disable this feature (*#*#4636#*#* Dialer options did not work).
On hardware front SD615 supports HD Voice and On Software front Androind Supports it from Lollipop onwards.
What we are all crying here is to enable this future by giving a software update. ( To say it again Network will not do this, Being a Manufacturer Sony has to do it.)
I have contacted Sony India Xperia Support team regarding this issue, and their replay was its a hardware limitation!!! and they will not help.
Emir, I hope you understand the situation, There is a reason why many are asking the same thing again and again. If there is a way you could help us that would be great,
Dear all cursed M4 aqua users,
Forget about it. Sony is not going to enable Volte on any old phones.
Its not only M4 aqua, all 2014, 2015 and early 2016 Xperia LTE Phones does not support Volte. Only Z5 and new X series support it.
Other Manufactures have not disabled Volte purposely on any of their models, It simply depends on their SoC Capability. To name Moto E2 that released on early 2015 and costs 1/5th of M4aqua Supports Volte.
So the costly lession we have learnt is
Sony will not care about Customer support or Satisfication,
Sony will not give anything thats needed, insted they dump all their crapy Apps and Softwares and they call them features.
Sony is not future proof ( not even for an year).
