Now you may put your iPhone into field test mode , which will allow to easily and exactly prove your cell signal response caliber . You just need to keep abreast these two easygoing steps :
• First , kick upstairs your iPhone 4 — or any iPhone — to iOS 4.1 .
• Dial * 3001#12345 # * into your phone .
Done . The signal bars will be replaced with a phone number ( like -85 ) . The more negative the routine , the worse the signal is . Example : -110 is bad than -85 . Once activate , you’re able to shift between signal legal profession and number by touching on the number .
Try the test mode now . Then employ a finger to link the two metal bands on the low left corner , over the smuggled plastic strip . That will short - circuit the wizard gap andbring the earpiece ’s sign downquite importantly .
https://gizmodo.com/wireless-expert-on-iphone-4-antenna-we-got-a-problem-5576839
To get out of the airfield test way , just hit the home clitoris . [ Thanks KTK1990 ! ]
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