iPhone 4 Antenna Reception fix

There is two solutions for iPhone 4 reception problem ( apart from buying a case ):

First solution is adding a small piece of tape over the bottom left of your iPhone, where there is a small gap. For more info watch below video

the second solution, it turned out the micro SIM touches the sim tray and when you hold your phone it confuses Baseband.

Points 1 and 2 are microSIM contacts, only for that purpose; point 3 is the microSIM tray itself – and if there’s some grounding or shorting going on between 1 and 3, or 2 and 3, or heaven forbid 1, 2, and 3 all at the same time or even sporadically, then again, “Houston, we have a problem.”

While gripping the phone tighter decreases the resistance and increases the capacitance effect on signal attenuation (wicks away more energy off the antenna bands), it could have the secondary effect as I’ve already noted of causing that gap between

points 1 and 2 and the microSIM tray itself, 3.

How to fix it:

  • Take the micro SIM out

  • use some sort of tape to avoid micro sim touching the edge of your sim tray

  • put your sim inside again

a dude who knows about RF explained here why the second fix works for most of us:

Let me add my explanation of why this fix works in many cases. I will qualify my assertion by saying that I have a good working knowledge of RF energy and have held various radio licenses over the past quarter century.

RF energy travels through the air in waves in the form of electromagnetic and electrostatic fields at 90 degrees to one another. The frequency of the transmitted wave has a ‘wavelength’. The transmitting and receiving antennas must be of the proper length to be ‘resonant’ at or near the wavelengths involved. In a nutshell, you will receive maximum signal strength when your antenna is the proper length.

Since we are talking about microwave frequencies here, the resonant length of the antenna is very, very short and will be thrown off resonance by a long ways with just the slightest change of ‘electrical’ length. I say electrical because aside from the physical length, changes in effective length occur with two phenomenon known as inductance and capacitance. Our bodies make for a good capacitor plate and this is how touch lamps can change brightness by sensing a capacitance change when we touch them.

The micro SIM tray is metal on the iPhone 4 and is part of the band surrounding the phone which IS part of the antenna on this new design. If the gold SIM contacts are touching or are too close to the metal tray, they are creating a shift in resonant frequency of the antenna which will degrade its reception of the cell frequencies it was designed for. The SIM contacts are NOT part of the designed electrical length of the antenna, but they can create a change of that length if they touch it. Those SIM contacts need to be as far away as possible from the physical antenna which the SIM tray is a part of on the new phone.

So now, you grip the phone with your finger bridging two of the antennas on the outside and you have killed the reception altogether because the antenna is way off resonance from the cell tower frequencies. Something to note here is that the BOTTOM of the phone’s metal band is the cellular antenna because the transmitted RF is required by law to be as far away from our head as possible.

This fix that the OP posted has technical merit and should be at least tried by those who feel comfortable messing with their SIM cards.


I have no explenation if these solutions don’t work but I would be more than happy to hear from you whether it works or not. leave a comment

PS: a video demonstration for second fix will be added soon

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