php - Why are SMS verification codes typically numeric? -


i in process of implementing sms verification process website , got thinking why sms verification codes (even send google) typically consist of numbers?

surely alpha-numerical code more secure numeric code?

the reason can think of numeric codes being prevalent perhaps latin/ascii alphabetical characters aren't readily available keyboards around world, while decimal numbers are?

  • much faster type (no switching number-input text-input)
  • easier remember (there ten numbers, not 26 chars)

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