Actually, there are diferent ways to do that.
By text messages using your sidekick phone # for the hearing people to call you ... it has limit characters to use each time .. it's ok but not great. Only that the hearie has to have the pager with txt msg capability to reach you by txt msg.
There is the other yet much better way which I use frequently and it's working wonderfully .. It is the My IP-Relay using AIM on your sidekick.
Any hearing person can call you thru your sidekick easy .. As long you do have AIM on. First you need to apply for your own FREE phone number by IP-Relay. The link below you can apply for it and follow directions and learn how it works.
It's the MY IP-Relay. You can even call hearing people thru them FREE anytime, anywhere! Even better you don't have to pay anything even the long distance, 24/7 .. even better, you can set up email address, preferrably your sidekick email address, to access you and leave a message with their phone number that you miss a call by a hearie. Cool.
I have used it since a year or so, and it always work. I give to my business people and family members. Even I call the stores or anyone I need to ask while on the road. They even can leave you messages if you miss the call, and the IP-Relay will send you email thru you pager. You would be always be connected. Just add myiprelay on your AIM buddy list after you apply for your free phone number on the link below. Cool.
Apply and get your own FREE phone number and set it up here at:
http://www.ip-relay.com/myiprelaynumber_info.html
Trust me you will like it and that sure will make your hearies accrepiate its simpility and effectiveness to reach you anywhere. Spread it around and tell deafies about its effectiveness once you know how. Easy and there is no such feature like they do so far! Enjoy.
ps. If you need any help on this, feel free to ask. There is a how-to guide onsite at the link here, too.