Oppo
Enable or Disable MMS Delivery Reports auf Oppo
Coloros lets you request a delivery report for MMS messages, similar to the read confirmation feature for SMS. Once enabled, the Messages app notifies you when an MMS has reached the recipient's device.
This is not a read receipt. The report only confirms that the message was delivered to the phone, not that the person opened or viewed it. If you need confirmation of reading, no such feature exists for MMS on Coloros.
To enable or disable this option, open Messages-App ➔ Menu ➔ Settings ➔ More settings ➔ Fetch MMS delivery reports.
From there you can turn the report On or Off separately for SIM1 and SIM2 if your device has two active SIM cards. This is useful if you use one number for personal messages and another for work, since delivery tracking can differ between the two.
Keep in mind that delivery reports depend on your carrier and the recipient's carrier supporting this feature. If the recipient's phone is off or has no signal, the report may be delayed or never arrive, even though the MMS was technically sent.