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• Not all phones have a user accessible field test mode. In particular, many GSM phones. • Some carriers lock out/remove field test mode. • If the code for your phone is not listed then we do not know what it is. What the numbers mean: Signal strength is a number ranging from roughly -50 to -105 (your phone may show as a positive number). Closer to zero means a better signal, i.e. -50 is better than -100. Audiovox 8300, 8500, 8600, 8615 Press ##2773 then press the END key. Scroll down and select