Perhaps you’re in a area with limited data coverage, no wifi or perhaps there’s just a service outage but you need to send an SMS but iMessage still want’s to have its way. Here’s how you resend an iMessage as an Sms.
- Find the failed iMessage in messages,
- Tap and hold on the failed iMessage
- Tap “send as text message”
Of course this will only work if the recipient has chosen to add a mobile number to their account.