SMS Bell (com.jrobertson.smsbell) on Google Play
Use this bell to call somebody when you want them! It makes a pleasant ringing sound, as you might find on a shop or hotel desk. In case they are not within earshot, you can switch on the SMS function and it will also send them a text message asking them to come to you (or whatever message you want). Using the contacts picker, select a contact and number and then simply enter your message.It does have ads, but these are unobtrusive - check out my other apps for a cheap version with no ads :o)