I contacted Microsoft on their facebook page and this is the conversation as of now-
Hi, I have been using lumia 950 for the last six months, and being such an expensive handset it is really disappointing that there is no option to enable VOLTE, which is easily possible even in cheap androids also. However as per the phones specification it does support VOLTE and HD calling.Please advise you have plans to enabled this feature with future updates. Thanks Sandeep Rawat Mob-9897244485, Email -
Sandeep3764@gmail.com
FRI 10:00AM
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Hello Sandeep! Glad you reached out. The VoLTE service varies by network operators. We suggest that you check with your service provider for availability. Please feel free to contact us if you need further help.
Hi, Please be advised that I am using Reliance Jio network, which is providing VOLTE service. The same sim when put on android phone , the VOLTE servce is working but when I put on my Lumia 950 it does not work. Please advise on this matter. Any kind of assistance would be highly appreciated. Thanks
FRI 11:07AM
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We understand your eagerness to get the VoLTE service. However, it would be best to contact your service provider regarding this issue. We're just here if you need further help.
SAT 5:00PM
Already contacted Reliance Jio- They said that their sim are Volte ready for any phone which support Volte.Please find the attched picture of Lumia 950 in US, which support VoLTE, however similar setting is not available with india specific phone. Please look into the matter and advise if any updtae will be required from Microsoft to enable this setting. Thanks
SAT 6:44PM
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Hello, Sandeep! VoLTE feature for Lumia 950 is only enabled by specific operators. If the SIM that you're using is VoLTE ready and it's having issues activating on your device, we recommend take your phone to your mobile operator to have it checked.