More testing reveals that depends more on the operator than on the phone:
Pepephone operator, krillin, arale and mako:
test-ss "*31#" -> Number shown in called phone. Shown status is "disabled".
test-ss "#31#" -> Number not shown in called phone. Shown status is "disabled".
Vodafone operator, krillin and mako:
test-ss "*31#" -> Number shown in called phone. Shown status is "disabled".
test-ss "#31#" -> Number not shown in called phone. Shown status is "enabled".
More testing reveals that depends more on the operator than on the phone:
Pepephone operator, krillin, arale and mako:
test-ss "*31#" -> Number shown in called phone. Shown status is "disabled".
test-ss "#31#" -> Number not shown in called phone. Shown status is "disabled".
Vodafone operator, krillin and mako:
test-ss "*31#" -> Number shown in called phone. Shown status is "disabled".
test-ss "#31#" -> Number not shown in called phone. Shown status is "enabled".