Bombitup is a Free Android app that lets you send unlimited SMS to any phone number.
TXT blast
TXT blast is a free SMS bomb Android app that works just like the online web version of it. You can enter any number and send unlimited messages to anyone
SMS Bomber Unlimited
This app has a very cool-looking interface and lets you select the maximum number of messages you would like to send in one go.
Is everything anonymous?
Yes, all of this is anonymous. These apps are purely for fun. Do not use them to avenge anyone.