When you look at your iPhone and want to know how strong your signal is, you see bars. You’ll see somewhere between one and five bars — one being the weakest and five being the strongest. This is a pretty vague reading, and it doesn’t give you the strongest idea of how strong (or weak), the cellular signal actually is. First, you’ll need to put your phone into field test mode. To do so, call the following phone number: *3001#12345#* and then — while in the field test menu — hold your phone until Slide to Power Off appears. Don’t power off...
Read the full article: How to See How Strong Your iPhone’s Signal Actually Is
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