iphone text message problem~

Please pay attention to see if the other party has turned on the iMessage function. This means that after the other party knows your mobile phone number or Apple ID, they can send you iMessage. It is used to send messages between Apple devices. , including computers mac and ipad, so only the traffic is counted, not the number of your text messages. Apple devices also have a face time function, which is equivalent to a video call when there is a network