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[Q] Phone Repaired, What Did They Do?

OP mdawdy

9th August 2014, 02:44 PM   |  #1  
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My S4 mini SGH-i257M was malfunctioning so i sent it in for repair. The local Rogers store sent it to FutureTel in Markham [Toronto] Ontario Canada. This is what they did, according to the Completion Report that came back with the phone ...

;RF Calibration performed to enhance RX/TX performance and network connectivity. Passed RF compliance test to meet manufacturer specifications. Adjusted battery level to optimize power usage.

It has been two weeks now and not only has it not malfunctioned, but the battery life is significantly improved - from 2 or 3 days of light use [usually just 2] to 5 days of light use.

What did they actually do? Does the recalibration affect hardware or software? Did they perhaps re-clock the CPU down to a slower speed? Any way to check this? What do they mean by adjusted battery level?

The phone is running KitKat 4.4.2, not rooted.

Thank you,

Mick
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10th August 2014, 05:50 AM   |  #2  
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Here are three replies from other forums to this same question. Anyone here want to include an opinion? It would be most appreciated ...
  1. The first part (RF calibration) means they adjusted the radio to improve reception and transmission(rx/tx), so your call/network/wifi reception will be better; the battery level adjustment implies they altered the voltage to improve battery life. In both cases it's more likely they replaced faulty parts with fully functioning ones. Good to see you finally got your issue solved Mick

  2. It seems like what they did is install the OS from factory state and give u a new battery and maybe re clocked the CPU. Unfortunately they won't give you the proper information on what they did nor will u able to find it. There are some apps which tell u what system and software it uses but that's about it

  3. All that I can tell you is RF stands for Radio Frequency. Apparently your cellular radio was tuned a bit off from whatever frequency(ies) your carrier uses. I wonder how they calibrate this.

    Their statement "Adjusted battery level to optimize power usage" makes no sense to me. It's almost an oxymoron! But then, when signal level or reception of signal is poor, firmware detects this and gives the hardware an extra kick of battery juice. So maybe that's what they adjusted?

    I'm really just guessing about RF calibration and battery adjustment. Hopefully somebody more knowledgeable will shed better light, especially regarding your questions about processor speed
Last edited by mdawdy; 10th August 2014 at 05:59 AM.
12th August 2014, 11:36 PM   |  #3  
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Quote:
Originally Posted by mdawdy

Here are three replies from other forums to this same question. Anyone here want to include an opinion? It would be most appreciated ...

  1. The first part (RF calibration) means they adjusted the radio to improve reception and transmission(rx/tx), so your call/network/wifi reception will be better; the battery level adjustment implies they altered the voltage to improve battery life. In both cases it's more likely they replaced faulty parts with fully functioning ones. Good to see you finally got your issue solved Mick

  2. It seems like what they did is install the OS from factory state and give u a new battery and maybe re clocked the CPU. Unfortunately they won't give you the proper information on what they did nor will u able to find it. There are some apps which tell u what system and software it uses but that's about it

  3. All that I can tell you is RF stands for Radio Frequency. Apparently your cellular radio was tuned a bit off from whatever frequency(ies) your carrier uses. I wonder how they calibrate this.

    Their statement "Adjusted battery level to optimize power usage" makes no sense to me. It's almost an oxymoron! But then, when signal level or reception of signal is poor, firmware detects this and gives the hardware an extra kick of battery juice. So maybe that's what they adjusted?

    I'm really just guessing about RF calibration and battery adjustment. Hopefully somebody more knowledgeable will shed better light, especially regarding your questions about processor speed

I also would like to know what they did with 'improving radio frequency'. Got the same problem as you, and would like to check if it's possible to manually fix the radio/frequency-problem, cause the guys from the repairshop didn't fix anything for me..

Otherwise: is there an app that notifies me when network connection is lost ?
I found this one : (updated url) https://play.google.com/store/apps/d...networkmonitor that works well..i now see immediately when my phone loses network connection.
However, now i still have to manually reset it by turning on/off airplane mode. Is there a way / app that does these steps automatically ?
So notifies when network dorps, and then refreshes it..

That would be one way to solve the problem i think..
Last edited by Mascarponi; 13th August 2014 at 10:14 AM.
13th August 2014, 02:04 AM   |  #4  
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Your link is to an earthquake detection app ???

I'll post more info later or tomorrow.
13th August 2014, 10:15 AM   |  #5  
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I updated the url. It's this app: https://play.google.com/store/apps/d...networkmonitor
It notifies when network is lost. However it doesn't refresh the network unfortunately.
13th August 2014, 03:14 PM   |  #6  
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Well, it gets worse. The phone messed up today same as before. A bit more than two weeks after the "repair". I was at home in one of the strongest signal areas. Would not receive or make calls or use mobile data. So back to the Rogers store. By the time i got there it had started working again so i could not demonstrate the problem. Also used a lot of battery power today, about 40% with light usage compared to 15% or less per day for the past two weeks.

What the counter guy at the Rogers store said is that there is nothing wrong with the phone, that all cell phones do this, and that i should adjust my expectations.

Here's another ConnectionChecker app. This one attempts to reconnect ...
https://play.google.com/store/apps/d...nectionChecker

Anyone have seen another app for this that they like?
Last edited by mdawdy; 13th August 2014 at 03:26 PM.
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13th August 2014, 05:35 PM   |  #7  
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Quote:
Originally Posted by mdawdy

Well, it gets worse. The phone messed up today same as before. A bit more than two weeks after the "repair". I was at home in one of the strongest signal areas. Would not receive or make calls or use mobile data. So back to the Rogers store. By the time i got there it had started working again so i could not demonstrate the problem. Also used a lot of battery power today, about 40% with light usage compared to 15% or less per day for the past two weeks.

What the counter guy at the Rogers store said is that there is nothing wrong with the phone, that all cell phones do this, and that i should adjust my expectations.

Here's another ConnectionChecker app. This one attempts to reconnect ...
https://play.google.com/store/apps/d...nectionChecker

Anyone have seen another app for this that they like?

Hey Mdawdy, thanks for posting that one, when reading the descripting it seems like this one is doing both things: checking when connection is down, and when it is, puts the phone on/off airplane mode so that it reconnects again.
I will be testing this one for this time now..

It's probably true that all cell phones lose connection some times, for example when being in a place where connection is very low, but the problem with this Galaxy s4 mini is that it doesn't reconnect again when in an area where signal should be good...
Probably some software thing i think..
I'm still at 4.2.2 by the way.

Edit: found out that with a non-rooted device with android 4.2 or above, it's not possible for an app to toggle airplane mode on/off. So there are probably no (non-root) apps existing that will do this .
However a forum member made a tool that does this: http://forum.xda-developers.com/xpos...elper-t2385625
Last edited by Mascarponi; 13th August 2014 at 09:16 PM.
14th August 2014, 02:59 AM   |  #8  
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Quote:
Originally Posted by Mascarponi

I updated the url. It's this app: https://play.google.com/store/apps/d...networkmonitor
It notifies when network is lost. However it doesn't refresh the network unfortunately.

I installed and tried this one. Appeared to be working altho i did not have a network drop. Then i turned on, used, then turned off Wi-Fi. From then on the App continually reported that the network was lost even when it was good. Restarting the phone did not fix it. So i uninstalled the app.
14th August 2014, 10:55 AM   |  #9  
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Quote:
Originally Posted by mdawdy

I installed and tried this one. Appeared to be working altho i did not have a network drop. Then i turned on, used, then turned off Wi-Fi. From then on the App continually reported that the network was lost even when it was good. Restarting the phone did not fix it. So i uninstalled the app.

For me it's also not working properly, and i bought the full version (
It's not notifing me when connection/wifi drops.. but I only see it when opening the app.

Also, like i said, i don't think there's an app that toggle's airplane mode on/off when gsm-connection is lost, because it's not possible with a non-rooted android phone that runs android 4.2 or above..
Very disapointing..
Last edited by Mascarponi; 14th August 2014 at 11:02 AM.

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