What's the difference between July 7th letter and SMS?

Different delivery methods have different content length restrictions.

1. Delivery method: July 7th letter refers to communication in the form of letters, which need to be delivered to the other party by mail or express delivery. Short messages are sent directly to the other party's mobile phone through the telecommunication network to realize instant text communication.

2. Limitation of content and length: There is no limit to the number of words in July 7th letters, and you can write long articles as needed to express more thoughts and feelings. Because SMS uses SMS channel, there will be a limit of 140 characters or Chinese characters, so it needs to be expressed concisely within a limited number of words.