>How many contacts can be sent in a group. We need up 50-100.

That would be no problem. The current size of a groups is 150.

>phone number without having to know the domain name.

Yes, of course. You do NOT need to know the mobile operator
of the mobile number.

>What are the US dollar charges for a subscription

The subscription is 10 USD and gives you one year of free updates
on all Mac and Windows software to send SMS.

See also:

http://www.smsmac.com/help/faq/subscrip/whyuseas.php

and the home page:

<http://www.smsmac.com>

Thanks!
--
Alco Blom - <mailto:alco.blom@...>

SMS Mac - the easy way to send an SMS
<http://www.smsmac.com>

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