Samsung Galaxy S4 mini — Phone Repaired, What Did They Do?

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Aug 9, 2014, 2:56:57 PM via Website

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,


  • Forum posts: 610

Aug 9, 2014, 6:19:12 PM via Website

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 ;)



  • Forum posts: 38

Aug 13, 2014, 3:43:39 PM via Website

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 a ConnectionChecker app. It notifies when network is lost. However it doesn't refresh the network ...

Here's another ConnectionChecker app. This one attempts to reconnect ...

Anyone here have another one of these to recommend?

— modified on Aug 13, 2014, 3:44:26 PM

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