What iPhone apps can I use for sending bulk SMSs?
Hopefully something very simple to get started with....
Built-in Group Messaging
On any iPhone with iOS 4 you can enable group messaging which will allow you to message a group and for responses to be sent to the whole group:
Other soltions include:
MassTextMsg app in the app store. The only one I found that is simple, pulls your contacts from you address book, and doesn't force you to sign-up for an account or a different phone number.