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Mine is working fine, no issues - also tested w/ incoming calls.
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Here is an article talking about Fallback Circuit tech and what is Sprint Spark/Triband Technology

explains some things as well as VoLTE not quite possible yet.
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The decision for Tri-Band devices was not predicated around SVLTE. It was decided on other, more important factors.


1. The main reason was for single radios. SVLTE devices have to maintain two separate connections, and thus two separate powered radios. The Tri-band devices have a single radio for all mobile network pathways and thus can operate with less power, meaning lower power use and leading to longer battery life.


2. Voice usage is dramatically lower now than it was even a few years ago, this means the need for most consumers to have both voice and data simultaneously is less. In addition, with the increasing use of Video Calling (which go over data only) that also reduces standard voice call usage.


3. Many companies are going this route, thus meaning similar devices for multiple carriers, and thus reduced costs for phones due to the scale of production. Having a separately built device to be unique in this regard, means the phones cost more for Sprint to purchase, and thus cost more to the end-user as well. Just look at the new*CCA*stuff where the fact the same identical device can be used across all of these small carriers in turn mean lower costs to all of them. The Youtube*keynote*is more informative and has Masayoshi Son, but he is a bit difficult to understand at some points (not used to Japanese accent personally). Production scale has a lot to do with it though.


4. CDMA customers aren't used to SVLTE in general, and the average person probably doesn't know their phone is even capable of it in some circumstances on various carriers.


5. SVLTE (Like SVDO on a couple devices) was never a designed feature of these phones, it was a side effect of the way the radios and transmit/receive pathways needed to be designed for the Sprint models of the phones. It was never an advertised ability.

This was copy paste from s4gru
But it's very true
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