How to solve the problem that iPhone 7 SMS shows no delivery?

First, the iphone Unicom number information cannot be sent out, and there is a red exclamation mark behind the information.

Second, the function of sending MMS and cellular data is not turned on.

First, the solution:

Call 100 10 to report the failure of mobile phone service. Please ask the service staff to tell us the number of the SMS center.

2. Enter ##5005*7672# (incoming call) to cancel the original wrong SMS center number.

3. Input: * 5005 * 7672 *+86 (130xxxxxxxxx correct SMS center number) # (long press 0 key to output+)

4. Input: *#5005*7672# Check whether the digital input is correct.

2. Turn on the function of sending MMS and cellular data,

1. Settings-Information-Send and receive MMS options, and then click Open.

2. Set-Cellular Mobile Network-Cellular Mobile Data option, and then click Open.