A text message in a campaign can fail due to the following reasons:
1. Carrier rejects the number
2. Bad/ landline number
3. Message sent to blocked number
4. Message sent but never delivered
For more information on why a particular sms failed:
1. Log into your SalesInvite account
2. Locate the failed SMS and hover your mouse over the info icon to see error code/explanation
3. You can locate an error code dictionary by clicking here.
Pro tip: Click "ctrl + f" to search for your exact error code