Hi 23, you've got a couple of options, if you want to bulk SMS everyone on the worksheet in one go you can do that with a couple of clicks on the main website (PC/Mac/iPad) if you've got Textlocal set up. Alternatively (or as well) you can call/text people directly from the mobile app by tapping their mobile number or the "Send SMS" link next to it. This will bring up the phone/SMS screen on your phone where you can insert a template if you have a phone/app that can do that. E.g. on my HTC Android it has a "Quick text" feature that works really well for this kind of thing.
Hope that answers your question! Are you trialling/using CP currently?