Boost iPhone Signal Reception with an Amplifier

Using the iPhone’s Field Test Mode allows you to easily find out which frequency your cell phone is using to access your cell phone carrier (usually AT&T). The instructions differ depending on whether your iPhone is using the 3G or non-3G network.

If your phone shows a 3G icon in the top left of the screen:

  1. Dial *3001#12345#* on the keypad and press call.
  2. Select “UMTS Cell Environment”
  3. Select “UMTS RR Info
  4. If the uplink frequency is a number between 4132 and 4233, your phone is using the 800/850MHz Band. If the uplink frequency is a number between 9262 and 9538, your phone is using the 1900MHz band.

If your phone shows no 3G icon in the top left of the screen:

  1. Dial *3001#12345#* on the keypad and press call.
  2. Select “GSM Cell Environment”
  3. Select “UMTS Network Information
  4. Scroll down to the bottom of the page and find the ARFCN
  5. If your ARFCN is between 128 and 251, then your phone is using the 800/850MHz band. If your ARFCN is between 512 and 810, then your phone is using the 1900MHz band.


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