Until hardly a decade back there were used to be big volumes of Telephone Numbers published by BSNL/MTNL consisting of not only the telephone number but the full address where the telephone is installed. Nobody raised the issue of privacy then. Even now BSNL/MTNL must be still publishing the Telephone Directories Citywise either in print or in soft copies. Problem is that the Cell Companies did not publish the Directories to the best of my knowledge so far.
Circulation of telephone numbers among the Society members is basically to ensure that members can interact with each other. I do not think such circulation of one's phone number among other members of society where they are living can be called breach of privacy.
My consideration was related only unwanted access by others using the society. The members' private mobile phone number against their will can be an extremely serious interference with their personal rights as we should not forget those unwarranted calls or messages which often floods in our mobile phones and this can not be justified in the name of circulation among members without just and specific cause. Moreover the case has to be decided on case to case basis as circumstances changed and we don't know the source of leaking data. So it is always preferable to circulate numbers in concurrence with the members and society.
But Sir, what if the list also contains contact details of the members as well? I mean to say may be member's address is enough but when mobile number is added into it, it should be shared in concurrence with the members! When we will accept that mobile numbers are personal property and not the property of any School or Employers or otherwise!