Why can't I send a text message to the Oppo mobile phone Unicom card?

Unicom number can't send text messages. You can check according to the following methods:

The balance of the number account is insufficient;

The SMS center number is set incorrectly;

The SMS sending number is wrong;

Mobile phone equipment problems.

Reminder: As the number of SMS centers in different provinces is slightly different, you need to contact and verify with your local area.