Questions tagged [mobile-phones]

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49 views

Telephone Call and Electromagnetic Waves [closed]

Can you give me a simple explanation of how do telephone calls work? I know that when I receive a telephone call, it means that my mobile has just received a certain Electromagnetic field. But in air ...
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1answer
183 views

How to cut a nano SIM out of a 8-pin SIM? [closed]

I have a 8-pin SIM, which I want to cut into a nano SIM (which only has 6 pins). Looking at the Wikipedia X-Ray image, I assume I should cut the lower 2 pins. Is this correct?
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0answers
65 views

Charge mobile phone using wind turbine

Using this tutorial as a guide, I have put together simple DIY wind turbine capable of giving around 2.5V - 3V output across the motor when spinning the fan blades. I can also light up some LEDs when ...
1
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2answers
136 views

How to add 0.2V per Ampère that device draws? (Voltage drop compensation)

I have noticed that many mobile phone chargers already do this: For each 1 A of current that the mobile phone draws, the charger's output will be increased by 0.05V or 0.1V or something similar, to ...
0
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1answer
54 views

SIM800: AT-command to get connected sender ids

I want to roughly estimate where my Arduino currently is. For this, I want to fetch the identification numbers of the stations it is currently connected to, so I can put them into an API which then ...
0
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1answer
48 views

If I need to send GPRS commands is it better to use a “proper” modem, arduino or a mobile? [closed]

I need to send some commands from a computer via GPRS protocol to some devices. The options I have found so far are: Commercial GPRS modem Arduino GPRS shield an old phone as GPRS modem Is there ...
1
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2answers
93 views

Identify that connector - Is it reusable?

I have an Asus Zenfone AR which has had the screen replaced 3 times. Last time I replaced it myself, Asus the first 2 times. Screen replacement went fine but once together I discovered up volume ...
1
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2answers
119 views

Is fast charging a Lithium-Ion battery from 0% to 30% better or worse for the battery health than fast charging at 30% to 70%?

According to this answer, fast charging is only recommended for the battery from 30% to 70% instead of 0% to 70%, while I thought that the emptier the battery is, the higher of a C rate it can handle. ...
0
votes
2answers
103 views

Batteries have a constant charging speed from 0%→70% instead of being any faster at 0%?

A mobile phone I tested keeps charging at the same constant speed from 0% to 70%, which is 10 watts. It uses MediaTek PumpExpress (input power: 12V 0.83A, despite the wall charger is capable of 12V 1....