Many mobile service providers such as Vodafone, T-Mobile or O2 offer the possibility to request a delivery report for SMS messages. This means that when an SMS is sent and arrived at the recipient, the sender is informed about it.
Here you may ask the question if it is possible to request a delivery report for already sent SMS messages.
The answer is as follows:
- No it is not possible to subsequently request an SMS delivery report for messages that have already been sent.
You can send a new SMS as the only option after the Delivery report option has been activated. The delivery report is then requested for this SMS message.
For example, a delivery report can be activated on a Samsung Galaxy smartphone for SMS messages as follows.