If you've got an HTC One M8 on Sprint, be on the lookout this morning for a system update. Sprint's rolling out software version 1.54.651.8. And while the changelog is for whatever reason vague — stability and call performance improvements, is all it says — you'll also see you now have the Extreme Power Saving mode.

This is an update we knew was coming, of course, as HTC previously told us it was waiting on U.S. carriers to approve the update that has already pushed out to non-U.S. versions of the M8.

Extreme power saving mode

Extreme Power Saving Mode is more of an emergency battery mode. It locks out most of the "smart" functionality of the phone, leaving you with a new home screen and access to only the phone dialer, and HTC's email, text messaging, calculator and calendar apps. No notifications. Not push anything. HTC says this mode can eke out some 15 hours of use on just 5 percent battery.

Look for the other U.S. carriers to push out this update in due time.

Source: Sprint; More: HTC One M8 forums Update image via @GoodByeBluMndy

There are 28 comments

Coolnee says:

Nice! Doing the update now! Sprint has been pushing out the updates first and fast lately for the One line of phones!

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flpalazzojr says:

I believe the new Sprint Spark animation is new on the splash screen, yea?

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Nope. It was there at launch.

Does it fix the problem of data symbol showing still while on wifi?

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cordawgfrito says:

That isn't a problem. It is suppose to do that.

Why would you want the mobile data symbol to show, even if you're on wifi? I know it bugs the hell outta me! Plus it still shows even if you turn mobile data off, so I feel like it's not supposed to do that.

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cordawgfrito says:

The mobile data symbol is suppose to be there when WiFi is on. It is like that on all new Sprint phones.

I have AT&T, the whole reason I posted here was to see if it fixed it so when they released the update for us, I would know.

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domoface says:

My Three (uk network) HTC one got the update too just now so hopefully most carriers will follow soon

ajpri says:

With this mode, will users be forced to use the stock SMS app or will the default be used?

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I just tested it, it uses the stock app but has my conversations from my preferred app (8sms)

Posted by my Nexus 7 (2013) or my i9300 (custom rom)

moosc says:

So take your smart phone and turn it into a dumb phone. Just what I want to do. Stupid HTC/Samsung

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Ace829 says:

Why would you bash an useful optional feature? This is a life-saver for people low on battery who are out somewhere and need to keep in contact with some people.

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Yea, you sound like an idiot....A dumb phone will suit you well.

If you are running low on juice, you would want this feature.

Its not designed for every day use. Just when you are low on power and need a phone because chances are you need the PHONE part more then you do to tweat your lunch or post it to instagram...

And you don't even have to use it. Just an option.

Forum Signature: Cuties has a juice now! (I don't work for Cuties, I just really like it)

smotrs says:

It's a shame Sprint/HTC aren't allowing distributors to sell the phone. Distributors like Best Buy, Radio Shack, etc.. are being told they can't sell it yet.

cordawgfrito says:

Best Buy is selling this phone.

did a manual check just about 20 minutes ago and got it.

Before this update, the android system process was always near 55-65%. now its down to 9-11% so thats good. Blinkfeed still sitting at around 25%.

EDIT: never mind, androud system process went back up to 29%......

Kiamat says:

I don't seem to have this setting on my unlocked version of the M8.

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92turbo2 says:

When will sprint stores sell this, I want to finance it,

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Phillycat says:

I think the street date is the 10th or 11th.

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flpalazzojr says:

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11th in stores. You can buy online or through telesales right now.

92turbo2 says:

Sweet thats what I wanted to know awesome thanks guys

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cordawgfrito says:

It went on sale on line for Sprint on the 25 March. It went on sale on Sprint stores 7 April

jdliveit says:

I bought my M8 from a Sprint store on April 6th (in Albuquerque)...

chazglenn3 says:

I bought mine yesterday in a Sprint store. (Seattle area)