Great comments, thanks. First, about the cost. I chose to charge 99 cents basically to ensure that the services keeps running: I wouldn't want to shut it down

Great comments, thanks. First, about the cost. I chose to charge 99 cents basically to ensure that the services keeps running: I wouldn't want to shut it down just because it becomes too popular. Next, after doing some market research, it turns out that one of the major uses of cell phones is exactly to ask people where they are, which can be inconvenient when the recipient does not really no. Sure, some cases do not require exact geolocation, but where you are meeting someone in a large/crowded area it is useful. Another feature we will be implementing in a next version is to provide directions to go where your friend is. Finally, yes I agree that trust is important. But I believe that this issue is not as drastic as you say since the text originates from the sender — his phone number.