Questions tagged [mobile-phones]

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6answers
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How does a mobile phone send signals? [closed]

I wonder how a mobile phone (handset) sends signals to the Base Transceiver Station (BTS). The BTS is obviously quite large and, thus, possesses much more power than a phone does. So, how is a phone ...
0
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0answers
11 views

Sector antenna dipole orientation

I have a question about the positioning of the dipoles inside sector antenna which are used in mobile communication. Usually, they are oriented perpendicularly to each other, so-called X-pol ...
0
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0answers
44 views

Phone replacement parts: original vs copy

I'm looking to buy a replacement micro USB board for my Xiaomi Redmi 6. As your can note for example on this product page, there exist "original" and "copy" versions for the same component. The "copy"...
0
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2answers
49 views

Using a “Normal” powerbank for a “Super Fast Charging” phone, are there any potential damages?

I have an Anker Redux 10000 mAh powerbank and a Samsung Note 10 Lite smartphone. My powerbank is capable of providing an output of 5V ⎓ 2.4A, with only "normal" charging mode (no QuickCharge or other ...
0
votes
1answer
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 ...
0
votes
1answer
474 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?
1
vote
2answers
328 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
votes
1answer
73 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
votes
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
vote
2answers
99 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
vote
2answers
130 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
104 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....