Root Access

9:23 PM

Okay, I have to ask this to someone, and as far as I can tell, there's not a single Stack site that it's on topic for.

You folks are the most knowledgeable

You know how different smartphones run on different frequencies... CDMA/GSM/etc. I was under the impression that LTE uses the same bands across all carriers; so, is it possible for me to run a 4G LTE, say, AT&T phone on Verizon by just popping the sim card in?

Rahul2001

Won't you have to unlock the phone first?

Mikey T.K.

Pretending the phone is already unlocked

(Do they even do locked phones anymore?)

Rahul2001

In theory, yeah, it would work...

Here in India, phones are sold by manufacturers, not carriers :D

Mikey T.K.

Yeah.. the US mobile market is hilariously bad

Michael Frank

@allquixotic could probably answer this for you.

0

Q: Can't browse any web page without being verified

Every time I tried to browse a web page , there is a request for being verified whether I am a robot or not . After I check the mark , that I am not a robot , then a question is appeared like check all the images with river , grass etc . Is there any way , that I can skip this ? This occurs ever...

qwertyuiop

9:33 PM

@MikeyT.K. No

LTE does not use the same band across all carriers.

electronbeam

I just tweeted for the first and last time in 6 months.... I don't think I'll ever top it.

My tweet was as follows:
Hey! This tweet is exactly 140 characters in length, the limit for every post, so that the entire tweet fits inside of a single SMS message.

qwertyuiop

LTE has more differing bands than anything that came before it.

Mikey T.K.

Nuts. Thought it was too good to be true.

You would not believe how much conflicting info there is about that.

qwertyuiop

Phones will work across most carriers because phones have 20+ bands these days.

Michael Frank

This sounds like a clever malware... Infecting computers and innocuously showing CAPTCHA's to the user everywhere they go in an attempt to humanize a remote bot.

0

Q: Can't browse any web page without being verified

Every time I tried to browse a web page , there is a request for being verified whether I am a robot or not . After I check the mark , that I am not a robot , then a question is appeared like check all the images with river , grass etc . Is there any way , that I can skip this ? This occurs ever...

ubuntu google-chrome browsing

qwertyuiop

9:35 PM

Just because it supports one carrier's bands does not mean it doesn't support every other carrier as well.

Michael Frank

@electronbeam Twitter recently allowed Tweets to be longer if they included a link or @/# tag in them.

qwertyuiop

@electronbeam Hi Satan

Michael Frank

So you can have your 140 characters AND a link AND a hashtag AND an @tag.

Rahul2001

@MichaelFrank Here are some proposed logos for finch :P

            _.-.
        .-.  `) |  .-.
    _.'`. .~./  \.~. .`'._
 .-' .'.'.'.-|  |-.'.'.'. '-.
  `'`'`'`'`  \  /  `'`'`'`'`
             /||\
            //||\\

OR

Michael Frank

well that second one looked like roadkill...

Rahul2001

9:41 PM

chat messes the formatting up :-(

             _..
 ___..-"""-.  `)^|   .-"""-..___
`-...___ '=.'-.'  \-'.=' ___...-'
        `\  ' ##### '  /`
          '--;|||||;--'
             /\|||/\
            ( /;-;\ )
             '-...-'

There!

Michael Frank

The second one kinda looks like the Great Seal of the United States.

electronbeam

@qwertyuiop hey babe

Rahul2001

@MichaelFrank It does rather...

Psycogeek

that funny superuser.com/questions/1097769/…

Oliver Salzburg

10:01 PM

you're

Psycogeek

or maybe not as Dead Links are so fashionable these days

@OliverSalzburg yea that one

Psycogeek

10:44 PM

ooookaaay , microsoft indicates that windows 7 does not support 4096 bytes per sector (represented as advanced format), but does after updating, support 512E or the emulated 512 of a 4096 bytes per physical sector. Native 4Kn including booting to it and full support starts at windows 8

support.microsoft.com/en-us/kb/2510009 & msdn.microsoft.com/en-us/library/windows/desktop/…

bwDraco

0

Q: Why are 3.8V lithium-ion batteries used in mobile devices, rather than 3.6V or 3.7V batteries?

I've noticed an odd trend in the lithium-ion batteries used in smartphones and tablets: rather than the 3.6V or 3.7V per cell typical of most Li-ion batteries in other types of consumer devices, they use 3.8V batteries that are charged to a maximum voltage of 4.35V (this is the case with both my ...

voltage batteries lithium-ion cellphone

This question's been nagging me for a while. Why 3.8V?

I thought most Li-ion batteries were 3.6V or 3.7V?

Psycogeek

@bwDraco well thats trickey. there is an new formula Li-Ion battery that is 4.35, and then there are people supplying batts for li-ion that do not actually use the new formula, but work with the new 4.35 , because All of them were good to about a max of 4.40 but dont tell anybody because they will try it and it isnt good.

even for a claimed to be new formulation battery, 4.2 is still better for its longevity. and in testing you can Not take a 4.35 to 4.5 , so is it really that different, or are they (as always) pushing it, or overclocking it within its original ability. (all that is also +-.05v)

summary, all 3.6v or 3.7v were mostly the same chemistry anyway, and would survive at charge voltages of 4.40. Spec was to stop at 4.20 (+-.05)

the 3.8v is supposed to be slightly improvement of the chemisty, and is speced to charge to a max of 4.35 , but there is no reality reason why the "real" improved formula, or old formula batteries faking it , and charing to 4.35 are that much different.

Psycogeek

11:21 PM

to further complicate it, the 3.6 3.7 3.8 were "nominal" voltages, which is like the average, mean or median (dont know for sure) or in english it could mean in name only :-) which is more accurate, because it depends on the load, and the age and the resistance and all if that any longer represents nominal.

when they jack up the max charge voltage, they tacked some numbers very loosly and poorly to the nominal voltage, which if you think about it are incorrect, but could identify a real new formula battery.

if there even is such things, other than purity and chemical tuning and increased safety and reduced possibility for outgassing

bwDraco

11:44 PM

It's very rare for one to find an 18650 cell with a 3.8V nominal voltage.

So why are cell phone Li-poly cells this way?

Psycogeek

@bwDraco i got a few of them (18650s). dont know if they indicated the 3.8 but they did specify the max charge (and to set to the capacity in the data sheet) it is 4.35 instead of 4.2v. It is also odd that originally even li-poly were classed 3.6 and cylindical as 3.7 , when they both acted much the same, except you could see a Bagged cell gassing easier :-)

bwDraco

Cell phone batteries these days are pouch cells, only that they're encased in a rigid block.

Psycogeek

The li-poly you know was a lot different electrolyte at first, thicker or gelled or whatever to make it more firm, but most info says that they eventually were more like the cylindrical, just bagged.

The cased square ones have been called "prismatic" but it is just a cylindrical cell in a different roll :-) it isnt even stacked like you would think, the ends are rolled up still. and even cheap china versions of these rectangular canned cells were pretty robust.

bwDraco

I can tell the difference between a prismatic Li-ion cell and a Li-poly cell.

Psycogeek

there are also advantages of squeesing or holding it all together, because the plates are going to be smushed better into the electrolyte wrap and compressed into staying were it works best, good deep full contact.

Transcript for