alright guys i have a samsung facinate .....and it dying so quick like from 100 to 70 in 45 mins normal use .......it is non rooted ....what should i do ....would wiping the cache even help or what!!!
just sounds like your battery is going bad.
so what does the clear cache even do if i may ask? and it wont help me at all ?:
cpfc33 said:
alright guys i have a samsung facinate .....and it dying so quick like from 100 to 70 in 45 mins normal use .......it is non rooted ....what should i do ....would wiping the cache even help or what!!!
Click to expand...
Click to collapse
Battery life is a big issue in smartphones, not necessarily any specific model.
Things to keep in mind, most of these phones have a temp sensor. If your battery
is hot, it will shut off the charger, full or not. Battery monitor widget will tell you
the temp of the battery, and I don't believe it requires root. My battery generally
stays in the mid 20's to low 30's, temp-wise. Also, the more radios you have
turned on the faster your battery will drain. WiFi, 3G, 4G, GPS, BT, they all drain
the battery, and if you have them all turned on at the same time, your battery
will go even quicker, and data roaming, or even partner-roaming can help drain
the battery. Some phones (notably some HTC models, not sure if any others have
this issue), will keep scanning for 4G, even after you turn 4G off. this bug has
been documented, not sure what the workaround is other than to shut 4G off and
reboot, if your phone is affected by the bug.
There are a lot of other useful tricks for improving battery life, including rooting and
installing a custom rom and kernel, underclocking the CPU (on rooted phones),
etc., the list goes on and on. There are also as many forums on XDA dealing with
this subject, including forums specific to your phone..can't remember the links
offhand, but the search button should point you in the right direction. Don't be
afraid to check forums related to other models as well, as a lot of the tricks are
universal between android devices.
Also, as mentioned, you could have a bad battery. Lithium cells don't like getting
too hot, and definitely don't like being exposed to excess moisture. If you read up
on some of the threads related to bad battery life, and the suggestions included
don't help, check into getting your battery replaced.
Hope this was at least helpful in some way.
you should root your phone and download setcpu to underclock your phone.Another thing that might be eating your battery is syncing and screen brightness
So thanks guys for the replies!!!! they were in every bit helpful but my ordinal question was what does the cache partition do and will it help to go in recovery node and delete it or doesn't it mater if your not rooted
bump?.......
Related
Hey guys,
I have a one big fat problem. Ever since I installed my very first custom ROM a battery drain on my Sensation became unacceptable. And it doesn't matter if I'm using a senseless rom or not. I also tried many different kernels with no luck at all. I never had those issues when I was using the stock rom. It never gets under like 200mAh even while sleeping, and when woke it sometimes gets even to 1000maH(!) while browsing internet and such. So is there anything I could possibly screw up or forget to do that may cause this problem? Help would be very much appreciated as I am really tired of charging my phone every 4 hours
Firstly download a few monitoring apps, Use them over the next few days and try to find out whether its app related.. ( i use watchdog ) there are many out there...
Do not overclock your CPU, Adjust settings for battery performance, Such as auto brightness, Turning off wifi / gps / data / BT and such when not using... See whether this helps or not
finally, if the above steps dont find anything, Try and 'calibrate' your battery... To do this, Run the phone down to zero battery, then switch it on again just to make sure its completely dead and will not power on at all... Then charge it fully to 100% no pauses.. When complete, boot into recovery and delete battery stats.
If all of them fail i would start thinking that the battery may be faulty.. But most extreme battery drains are caused by one of the above
Hello,
I'm a first time poster looking for a little help. I've had my Verizon SIII for about a week now and almost everything about the phone I have loved with the exception of the battery life. Given the 2100mah battery I was expecting much more. I tend to be a fairly light user throughout the day at work, I have the screen brightness turned down, all data is off, and I really only am using it for texting, maybe a little bit of gaming. I have found that if I unplug at about 8am by about 6 or 7pm the battery will be nearly completely drained.
Noticing that this seemed to be a fairly common problem I started doing some research to determine the source of this. First, by looking at the battery stats I observed the same problem that many others observe, a heavy drain in standby mode.
ttp://i.imgur.com/2drJy.png (since I'm a first time poster I can't add external links, please just add an H to the beginning of the url)
So going off of this I started trying to determine the cause of this drain in standby mode. I should also mention that at times the phone does seem to get warm in the bottom left region of the back of the phone. I had read one tutorial explaining about wakelocks so I decided to check that out. I downloaded GSam Battery and CPU Spy to see if something was preventing my phone from entering standby mode properly. However my phone was entering deep sleep as shown below, so this confused me a bit. But clearly there is some issue visible in the standby mode of my phone, sometimes the battery will drain ridiculously fast (as high as 1% every 5 - 10 minutes). And keep in mind that this is while virtually everything, data included, is disabled. So that eliminates the possibility of it simply having to search for a signal in a weak area.
ttp://i.imgur.com/pekXb.png
ttp://i.imgur.com/xauHF.png
ttp://i.imgur.com/2drJy.png
Basically I'm having a tough time getting to the root cause of this problem. I feel like there's some little software issue in there that is draining it. But I've been pretty smart about the apps that I've downloaded, I've stuck with only very common and popular ones. So would anybody have any clue to how I could identify and address the source of my battery drain?
Thanks
mmisley3 said:
Hello,
I'm a first time poster looking for a little help. I've had my Verizon SIII for about a week now and almost everything about the phone I have loved with the exception of the battery life. Given the 2100mah battery I was expecting much more. I tend to be a fairly light user throughout the day at work, I have the screen brightness turned down, all data is off, and I really only am using it for texting, maybe a little bit of gaming. I have found that if I unplug at about 8am by about 6 or 7pm the battery will be nearly completely drained.
Noticing that this seemed to be a fairly common problem I started doing some research to determine the source of this. First, by looking at the battery stats I observed the same problem that many others observe, a heavy drain in standby mode.
ttp://i.imgur.com/2drJy.png (since I'm a first time poster I can't add external links, please just add an H to the beginning of the url)
So going off of this I started trying to determine the cause of this drain in standby mode. I should also mention that at times the phone does seem to get warm in the bottom left region of the back of the phone. I had read one tutorial explaining about wakelocks so I decided to check that out. I downloaded GSam Battery and CPU Spy to see if something was preventing my phone from entering standby mode properly. However my phone was entering deep sleep as shown below, so this confused me a bit. But clearly there is some issue visible in the standby mode of my phone, sometimes the battery will drain ridiculously fast (as high as 1% every 5 - 10 minutes). And keep in mind that this is while virtually everything, data included, is disabled. So that eliminates the possibility of it simply having to search for a signal in a weak area.
ttp://i.imgur.com/pekXb.png
ttp://i.imgur.com/xauHF.png
ttp://i.imgur.com/2drJy.png
Basically I'm having a tough time getting to the root cause of this problem. I feel like there's some little software issue in there that is draining it. But I've been pretty smart about the apps that I've downloaded, I've stuck with only very common and popular ones. So would anybody have any clue to how I could identify and address the source of my battery drain?
Thanks
Click to expand...
Click to collapse
This may be worth a try http://forum.xda-developers.com/showthread.php?t=1732722
or this http://androidapplikation.info/2012/07/cpu-sleeper-2-4-apk-for-android-free-download/
Hope it helps
You don't have to thank me there is a button for that
Download and try Watchdog Lite. It's a really good monitor for finding out which apps are acting up.
This doesn't exactly answer your question, but can help with your problem. There are programs that can help to drastically improve battery life by turning off data (3g\4g) while the screen is off. This can double your battery life or more, especially for lite/moderate users. Most of these programs work by turning on the data 1 minute out of every 15 the screen is off. That way you still get email, and notifications. You still get txt and phone real time, as they do not rely on data. When you turn the screen on data is turned on, when you actually would want to use it. Especially in 4g areas this really saves battery, as 4g is a battery hog.
Battery Defender is my favorite. I feel like I should be paid for this advertisement...
Do you have BATTERY SAVER option ENABLED in settings? That makes a huge difference for me.
It sounds like you are still stock, but I used the Root66 image and after that started having huge battery drain. I did a factory reset to no avail, so then moved to Synergy Rom. Since then, I've had outstanding battery life! not sure if you were thinking about going this route, but it has worked for me. Synergy is debloated so I assumed Verizon crap to be the culprit.
The images I saw were all at 100% battery. Those are not very helpful. A shot of your battery stats at the end of the day would be a lot more useful.
Please note that Cell Standby reports incorrectly at the moment on the S3. Unless you do the fix linked above, it will nearly always be at the top, but it does not actually drain that much battery, it is simply a reporting issue.
Ello Folks,
I'm new to this forum and for some stupid reason I can't post within the forum I wanted to, so I hope someone can help me here..
I have been playing with Custom Roms for a long time and I have ALWAYS encountered problems regarding battery drain. I have searched innumerous times for ways to fix it.. I've tried many different ROMS and KERNELS and I always ended up with a massive battery consumption with little use. I then thought it was my battery as the device is quite old so I decided to buy a new original battery and still having the same problem.
I am starting to think that I am really dumb and doing something wrong or maybe I am just unlucky. I got my phone back in 2011 from T-Mobile UK and I am now running JB 4.2.2 Revolt JB I9100 and Dorimanx V9.33 as kernel.
My battery is going from 100% to 0% in like 4 hours. Any help would be very much appreciated.
Thanks
leoarten said:
Ello Folks,
I'm new to this forum and for some stupid reason I can't post within the forum I wanted to, so I hope someone can help me here..
I have been playing with Custom Roms for a long time and I have ALWAYS encountered problems regarding battery drain. I have searched innumerous times for ways to fix it.. I've tried many different ROMS and KERNELS and I always ended up with a massive battery consumption with little use. I then thought it was my battery as the device is quite old so I decided to buy a new original battery and still having the same problem.
I am starting to think that I am really dumb and doing something wrong or maybe I am just unlucky. I got my phone back in 2011 from T-Mobile UK and I am now running JB 4.2.2 Revolt JB I9100 and Dorimanx V9.33 as kernel.
My battery is going from 100% to 0% in like 4 hours. Any help would be very much appreciated.
Thanks
Click to expand...
Click to collapse
Batter drain in 4 hours is not normal. But with heavy usage of 3g/4g it can be. As you said you got heating problems too.
So, first with the battery. Install betterbatterystats from play store. Let the battery drain off completely and charge it to 100 in a go keeping data network/Bluetooth/GPS/WiFi in off mode. Check how much time it's taking to charge it from 0% to 100%. Now discharge it off to 0% and Check the rate of discharge. If it's below 5%/Hour you are safe.
But if it is as you said before 4hours battery backup, there must be some trouble.
These kinds of drastic battery drain happens of many reasons.
1. Poor signal strength.
2. Overloading cpu ( which also cause overheating)
3. Any background running apps which utilizing a bunch a data.
4. Bad kernel (we can pick this out as you tried different kernels.)
5. Defective battery.
Or a last chance
6. A hardware failure.
So inorder to find the root cause behind this problem check each of the possibilities one at a time.
In case of cpu, change the governor and I/o scheduler and see.
In case of background running apps, check whichever programs revising maximum amount of battery.
Hope it helps..
jabrif said:
Batter drain in 4 hours is not normal. But with heavy usage of 3g/4g it can be. As you said you got heating problems too.
So, first with the battery. Install betterbatterystats from play store. Let the battery drain off completely and charge it to 100 in a go keeping data network/Bluetooth/GPS/WiFi in off mode. Check how much time it's taking to charge it from 0% to 100%. Now discharge it off to 0% and Check the rate of discharge. If it's below 5%/Hour you are safe.
But if it is as you said before 4hours battery backup, there must be some trouble.
These kinds of drastic battery drain happens of many reasons.
1. Poor signal strength.
2. Overloading cpu ( which also cause overheating)
3. Any background running apps which utilizing a bunch a data.
4. Bad kernel (we can pick this out as you tried different kernels.)
5. Defective battery.
Or a last chance
6. A hardware failure.
So inorder to find the root cause behind this problem check each of the possibilities one at a time.
In case of cup, change the governor and I/o scheduler and see.
In case of background running apps, check whichever programs revising maximum amount of battery.
Hope it helps..
Click to expand...
Click to collapse
Cheers mate,
I am well aware that custom kernels allow me to overclock it and change governors and i/o and that these kinda settings have a major role on how much battery the device will consume. But as I have never really understood the diferences btw them I for once have never played with the values so I have always left 'em at their default value.
The only real reason I've decided to change to a Custom Rom is to get new versions of the Android OS and to get rid of the hideous TouchWiz skin from Samsung..
I am not living in the UK at the moment as got transfered to Brazil for work and I have been on TIM network and they suck badly so maybe cuz their 3G sucks its whats causing my battery to drain like crazy.
But I will definitely follow your instructions and hopefully I'll get a positive result..
Once again, thank you very much.
Dear XDA experts,
It seems I have a typical problem for most Samsung Galaxy S3 I9300 users. I've been testing my phone's battery capacity on two different batteries, and four custom roms, yet something leeches out their power incredibly fast.
I've been deeply investigating the issue across the web, with no prevalent solutions that worked. Below I will describe exactly what my problem is, my specs, and what I've done to this point.
This will be my first post. I'm only doing this because I want to bring BetterBatteryStats data into consideration, without just speculating "do this". Please have mercy on my soul - I really appreciate all the stuff on the forum, and I wouldn't like to violate any rules.
Problem
My Samsung Galaxy S3 I9300 drains my batteries as a vampire, regardless of what I've tried. Just to give you an example: the phone loses 6% out of a 100% in just 40 minutes of standby, while being optimized, with no "lost signal" search processes. Without charging it twice a day, the S3 remains mostly unusable.
Purchase and Specs
I'm its second owner. The previous one sold it to me through an auction site (he was changing to S4). The phone seems legit. Mint conditions, little or no scratches visible. The system was factory wiped, and later it turned out that it wasn't flashed before. I also got original Polish carrier boxing with instructions, and equipment.
Note: The guy didn't handle the receipt to me, and I don't know if there's still warranty on the phone. Servicing might not be an option.
System:
[Cannot upload - all files in a MediaFire folder. Please look over there. Just add the missing characters]
www (dot)mediafire(dot)com(slash)folder(slash)wfb1spe9ez9al(slash)xda_S3_thread
SentinelROM 6.00
3.0.64-CM-gfab9e4c Kernel
Android 4.4.2
Factory battery EB-L1G6LLU 2100 mAh
Second battery M-Life ML0373 2300 mAh 8.5Wh 3.7v Li-ion
Normally, Bluelight Filter and GoLauncher EX Prime are the minimum that I have in the background.
What I've already done
Rooted my S3 with CM Autoroot
Installed CWM Recovery 6.0.4.6
Always did a factory, cache, and dalvik wipe
Tested CM11 NIghtly from 09.12.14
Tested CM10.2 Stable
Finally flashed SentinelROM 6.00 4.4 KK
Debloated my phone - not syncing, no tracking
Disabled "All, that's Google" #notonmywatch
With every new ROM, I've been optimizing settings and tweaking the CPU to ONDEMAND. Also, same time I've been running Go Power Master and Greenify. That covers nearly everything people were recommending in the many threads I've visited.
Weird facts
Phone can lose 6% in 40 minutes after charge while idle
Writing an sms can take as much as 10% of the battery
It seems odd that the S3 can fully charge in just 1h on both batteries
When trying to discharge my phone, it deadlocks below 4%, lasting unusual 2.5h when used
Screens
I've been monitoring my phone for a day with BetterBatteryStats while I had Greenify hybernate some apps. Obviously, I've seen an improvement in the performance, but it just seems not right. There's a lot of pics here, but I hope that someone can spot a tracing app, or some other spying tactics, because I just can't explain what's on.
[Cannot upload - all files in a MediaFire folder. Please look over there. Just add the missing characters]
www (dot)mediafire(dot)com(slash)folder(slash)wfb1spe9ez9al(slash)xda_S3_thread
That's all I have for now. I think it would be a great favor to everybody on XDA to finally crack the case. I'm open to suggestions, and I can run tests on the S3 and provide results here.
Last question
Could someone recommend the best ROM and kernel for energy optimization?
Thank you, and good luck.
PS: Imagine playing Watchdogs with Aiden having an advanced S3 phone... Wouldn't happen
Your symptoms sound like bad batteries honestly. The biggest giveaway here is that the battery drains ridiculously fast to 4% then lasts the "normal" amount of time. This is usually indicative of dead cells.
My suggestion, buy another battery, avoid the cheap aftermarket batteries, either go stock or a good quality 3rd party battery and see if it changes anything.
How long between flashes are you allowing your device to settle? Battery drain may appear high on fresh flashes for the first few cycles, this could also contribute to what you're seeing.
conmc
Stryke_the_Orc said:
Your symptoms sound like bad batteries honestly. The biggest giveaway here is that the battery drains ridiculously fast to 4% then lasts the "normal" amount of time. This is usually indicative of dead cells.
My suggestion, buy another battery, avoid the cheap aftermarket batteries, either go stock or a good quality 3rd party battery and see if it changes anything.
How long between flashes are you allowing your device to settle? Battery drain may appear high on fresh flashes for the first few cycles, this could also contribute to what you're seeing.
Click to expand...
Click to collapse
Hello Stryke,
Did you had a chance to look through the screenshots? I might buy a legit Samsung battery, but just something tells me that could not work. I've already seen posts from people saying they tried replacing the battery with another original, but without luck.
I must admit that I didn't consider the time in between flashes as important (never heard about it previously). Normally, I would just copy my zips to SD, reboot to recovery, do a wipe and then flash.
Please tell me - what do you think about the charge time? Is 1 hour enough for a full charge?
I welcome any other suggestions!
zulugulu said:
Hello Stryke,
Did you had a chance to look through the screenshots? I might buy a legit Samsung battery, but just something tells me that could not work. I've already seen posts from people saying they tried replacing the battery with another original, but without luck.
I must admit that I didn't consider the time in between flashes as important (never heard about it previously). Normally, I would just copy my zips to SD, reboot to recovery, do a wipe and then flash.
Please tell me - what do you think about the charge time? Is 1 hour enough for a full charge?
I welcome any other suggestions!
Click to expand...
Click to collapse
Generally no, even with fast charge my note takes longer than 1 hour to fully charge. I'd try the new battery, that will at least rule out one possibility. Time between flashes can make a huge difference as well, especially if custom kernels are involved.
Hi guys, wondering if anyone can help
I bought a new unlocked T-Mobile LG G5 from ebay last week for my wife, after buying it I didn't realize that the unlock code is a software unlock, not a SIM unlock, and that I am not able to flash to the stock LG firmware if I want to keep the unlock on hand.
I was looking at flashing to stock because the battery life is quite poor for a new phone, much worse than my S7 Edge, even though she doesnt do anything crazy on it. Are there any tips or tricks to improve the battery life, its using H83020i_un software with what appears to be the regular/default T-Mobile stock apps...
Any help would be appreciated, either regarding the battery, the unlock, or both. Also, will I get any OTA updates, and if I do will it re-lock the phone? Im in Canada btw
Thanks
There is a thread covering all the ins and outs of the 20i_un custom SIM unlock ROM. Everything about locking and updates is thoroughly discussed 1 thread up from this one.
About battery life, that ROM shouldn't be impacting battery life. You should get 4 hours of screen on time (roughly) per charge. If that's not enough to get you through the day, then this isn't the phone for you.
If you aren't getting 4 hours of screen on time, something is wrong. It's not the ROM because the ROM is PROBABLY the stock ROM with 1 small modification for SIM unlock.
Things like Facebook are NOTORIOUS battery drainers so if you run a lot of apps like that, they could be hurting you. Have you looked at your battery stats? Do any apps jump out as taking up a lot of battery? Is it the Android system that's using the battery?
Android's battery stats chart will tell you a lot about what it using your battery. We'd need to know what it is before we could suggest fixes.
Also...be sure to leave the seller negative feedback on eBay. This phone was misrepresented on eBay, even after they were aware if was not factory sealed and had been modified. They lied about how many they had too, saying they were nearly out of stock at least a thousand units ago. That's deceptive advertising. They lied to multiple people about putting that second clear seal over the broken factory seal. And they contacted at least me outside of the eBay message system which is a blatant violation of the eBay terms of service. Even if you keep it, the seller deserves negative feedback.
Skipjacks said:
There is a thread covering all the ins and outs of the 20i_un custom SIM unlock ROM. Everything about locking and updates is thoroughly discussed 1 thread up from this one.
About battery life, that ROM shouldn't be impacting battery life. You should get 4 hours of screen on time (roughly) per charge. If that's not enough to get you through the day, then this isn't the phone for you.
If you aren't getting 4 hours of screen on time, something is wrong. It's not the ROM because the ROM is PROBABLY the stock ROM with 1 small modification for SIM unlock.
Things like Facebook are NOTORIOUS battery drainers so if you run a lot of apps like that, they could be hurting you. Have you looked at your battery stats? Do any apps jump out as taking up a lot of battery? Is it the Android system that's using the battery?
Android's battery stats chart will tell you a lot about what it using your battery. We'd need to know what it is before we could suggest fixes.
Also...be sure to leave the seller negative feedback on eBay. This phone was misrepresented on eBay, even after they were aware if was not factory sealed and had been modified. They lied about how many they had too, saying they were nearly out of stock at least a thousand units ago. That's deceptive advertising. They lied to multiple people about putting that second clear seal over the broken factory seal. And they contacted at least me outside of the eBay message system which is a blatant violation of the eBay terms of service. Even if you keep it, the seller deserves negative feedback.
Click to expand...
Click to collapse
Yeah I did notice that about the seal when I opened mine.
I noticed the battery drains alot while idling, not sure what could cause that though...
Well...look at the battery stats charge in the settings. It will tell you what's using the battery.
Are you using the Always On Display? If so that's your answer. That chews up battery like crazy at around 0.8% per hour. Conversely I get 0.1% to 0.2% drain per hour on idle with the Always On Display turned off.
I'm also a fan of Greenify for putting the phone into Doze mode after minutes rather than an hour or two like Android does natively. I'm not a huge fan of Greenify as a task killer as that's counterproductive in most cases. Though I do let it kill an annoying persistent Major League Baseball app that I like but that doesn't know when to shut up.
Skipjacks said:
Well...look at the battery stats charge in the settings. It will tell you what's using the battery.
Are you using the Always On Display? If so that's your answer. That chews up battery like crazy at around 0.8% per hour. Conversely I get 0.1% to 0.2% drain per hour on idle with the Always On Display turned off.
I'm also a fan of Greenify for putting the phone into Doze mode after minutes rather than an hour or two like Android does natively. I'm not a huge fan of Greenify as a task killer as that's counterproductive in most cases. Though I do let it kill an annoying persistent Major League Baseball app that I like but that doesn't know when to shut up.
Click to expand...
Click to collapse
Always on display is off, using greenify, helped a bit, but I notice that most of the battery usage % is "Phone Idleing"
Agree, in the past month or so, my LG G5 battery life has become noticeably worse. The top two battery burners are Android OS and Phone Idle. I've tried multiple hard resets, clearing cache, etc, but nothing seems to help. I haven't shut off the always on display, but it wasn't shut down before. Something has changed recently, maybe in the last update, but the battery life is terrible now. Any help would be appreciated.
hawkintx said:
Agree, in the past month or so, my LG G5 battery life has become noticeably worse. The top two battery burners are Android OS and Phone Idle. I've tried multiple hard resets, clearing cache, etc, but nothing seems to help. I haven't shut off the always on display, but it wasn't shut down before. Something has changed recently, maybe in the last update, but the battery life is terrible now. Any help would be appreciated.
Click to expand...
Click to collapse
If youre on 20k update, then I agree. Battery life was fine until 20k update. Now I cant get through lunch. Battery stats is not helpful. Shows no issues.
coreygator said:
If youre on 20k update, then I agree. Battery life was fine until 20k update. Now I cant get through lunch. Battery stats is not helpful. Shows no issues.
Click to expand...
Click to collapse
I have had no change in battery life since updating to 20k
Skipjacks said:
I have had no change in battery life since updating to 20k
Click to expand...
Click to collapse
Thanks for the info. Will try a factory reset and see if that helps.
coreygator said:
If youre on 20k update, then I agree. Battery life was fine until 20k update. Now I cant get through lunch. Battery stats is not helpful. Shows no issues.
Click to expand...
Click to collapse
Do u know how to downgrade?
Sent from my LG-H830 using Tapatalk
Were you ever able to solve the battery problem?
There are a couple of comments on the previous page that Phone Idle is a large consumer. That happens when you pick the wrong carrier, and the signal is weak most of the places you spend time. When that happens, it's assumed that the phone's signal will be weak at the tower, so the phone transmits at maximum power - and that kills a battery fast. Choose a carrier that has solid green in the battery stats (tap the graph to get to that page, then scroll down). That's the first thing you should do when choosing a carrier - not that they're the only ones carrying this great new phone so far, but that they give you a solid signal where you spend most of your time. And it's exactly what most people don't do (because they're not aware of it). (And the phone matters too - some just have more sensitive receivers than others.)