SMS Alert was built to solve 3 major problems in one simple application.
You enter a keyword filter and/or a incoming phone number into the application (for e.g. urgent, asap, a phone number) and share it with family, friends and others. When someone sends a SMS with the keyword filter text or if incoming phone number matches the phone number you entered in the keyword filter, phone will ring even if it is in silent mode.
If you are an IT person, pregnant women's beloved hubby, on-call doctor, professor or anyone carrying a pager - this application can allow you to keep your phone in silent mode but still RING when its urgent. A simple SMS containing text when matches "keyword filter text" you specified in the app will ring your phone like a PAGER. You can also add multiple keyword filters or phone numbers (separated by comma) to ring your phone in different situations.