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If my smart phone or other electronic device only supports use of numbers, not alphabetical and special characters, is that acceptable authentication?

April 26, 2017acceptable alphabetical characters device electronic Numbers phone SMART special supports

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If my smart phone or other electronic device only supports use of numbers, not alphabetical and special characters, is that acceptable authentication?

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If the electronic device does not support use of complex passwords for authentication, use a non-obvious number sequence. For example, don’t use numbers associated with you such as your employee ID or part of your phone number.