Careful to release your phone number to a stranger, worker or passers-by Because you may not know what you will be or could happen. DO NOT give someone’s phone number to another person without permission and when doing so, GIVE only one of his/her popular number, NOT all his/her numbers.

Facebook, whatsApp etc is only good for evil, be disciplined Flashing is beeping-Do so only If you are asked to do so
Call only once at least he/she will Later see your miss-call.
And if necessary, send text SMS Be disciplined about phones Whatever is good is because is Rightly Used.