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IMS, Not VoLTE, is the Future of Voice with T-Mobile

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Feb 28, 2012, 7:30 AM   by Eric M. Zeman

T-Mobile is not looking at VoLTE as a calling option for its LTE 4G network, and will instead transition its cellular voice services to the IMS-based Wi-Fi calling feature that's already present on its smartphones. T-Mobile USA senior vice president of marketing Andrew Sherrard told Phone Scoop that the company has worked with its hardware partners in recent quarters to make sure that the IMS-based Wi-Fi client is on board many of its smartphones. Unlike the UMA service that T-Mobile offered several years ago, the IMS-based Wi-Fi service cannot hand calls off from Wi-Fi to the macro cellular network when customers leave Wi-Fi coverage. The call will drop. This will current problem will not apply to LTE 4G, which can support IMS-based calls. T-Mobile will continue to add the IMS-based calling client to all its devices as it transitions from HSPA+ to LTE over the next few years. T-Mobile believes that IMS will be its technology of choice for voice calls across its LTE 4G network.

source: T-Mobile


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Feb 28, 2012, 7:41 PM

does that mean

does that mean without the IMS-based client, you can't make phone calls over LTE on T-Mobile? Currently the wifi-calling client isn't a downloadable app because it requires a custom ROM and is only available on stock T-Mobile ROMS. Assuming that will continue to be the case, does this mean if I buy a future LTE 'nexus' phone or flash a different ROM on my LTE T-Mobile phone that I'm SOL if I wanna make calls over LTE?
oops I meant 'custom kernel' not ROM
I don't think so. I know that it does not matter the version of android, from what I understand, the phone must have built-in IMS capability. So far the only phones that T-mobile offers with that new IMS wifi calling is the Amaze, Galaxy S II, and LG...

Feb 28, 2012, 7:58 AM

What Standard?

Does anyone know what standards/specifications T-Mobile will use to support their IMS based WiFi Voice services?
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