NOTES
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All my calls become garbled after a few minutes, and it comes and goes intermittently. This has been reported by users of this extender.
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Below are FOUR different scenario results from using Field Test Mode by dialing *3001#12345#*
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I have dialed #48 to verify that the network extender if connected to my iPhone 17, and it defintely is.
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​Without the Network Extender I get 1 or 2 bars, so calls drop or fade. WITH the extender I have 4-5 bars, but the voice quality deteriorates as per above.
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I have twice done a Network Reset on this brand new iPhone 17. Earlier phones all had the same calling issues here, even visitors with Verizon.
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12/17/2025:
Re: Rae's advice: I tried a day with the phone set to " LTE" instead of 'Auto 5G' in the Apple Iphone Voice & Data settings.
No improvement on garbled calls
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SEE RESULTS FROM SIGNAL FIELD TEST AT PAGE BOTTOM
Field Test Mode:
Field Test Mode is a hidden feature on most smartphones that gives you all the details about your mobile network—things like signal strength, signal quality, and even which frequency bands are in use. It’s a tool usually used by technicians, but you can use it too. The best part? You don’t need any special apps or tools—just your phone!
Field Test Mode is much more accurate than signal bars or speed test apps because it gives you real-time data that shows exactly how strong your signal is and how clear it comes through. It’s a great tool for anyone looking at a cell phone signal booster to improve their cell signal.
Field Test Mode provides three key numbers you’ll want to know:
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Signal Strength (RSRP): This tells you how strong the signal is when it hits your phone. It’s measured in dBm (decibel milliwatts). The numbers usually range from -50 dBm (excellent) to -120 dBm (very weak). The closer your number is to zero, the better your signal.
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RSRQ (Reference Signal Received Quality): This tells you how clean or clear the signal is. It's measured in dB (decibels). The range is usually between 0 and -20 dB. The closer to zero, the better the quality of the signal.
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SINR (Signal-to-Interference & Noise Ratio): This shows how much interference or noise is affecting your signal. Higher numbers are better. Anything above 20 dB is great.
These numbers give you a better idea of how strong your signal is and whether there’s too much interference. If your signal strength is weak, you’ll need a more powerful signal booster. If your signal quality is poor, a directional antenna can help cut through the interference."
