Is the SMS capacity limited by the number of messages or bytes?

I don't know what you mean by this ability, but I can give you a simple analysis:

First of all, the number of inboxes in a mobile phone is limited. Basically, the number of messages in each mobile phone is different. I remember that in the past, the inbox of a mobile phone could only receive 70 messages at most. After the number of messages is full, I can't watch any more. I can't see new messages until I delete them. Now the number of inboxes in many mobile phones has been greatly expanded, and some mobile phones can receive two or three hundred.

Secondly, there is also a length limit for each message. You can usually write dozens of words. Of course, it is also possible for some good mobile phones to write hundreds of words, depending on the mobile phone.

Third, sometimes we will encounter such a situation. My SMS can hold more than 100 words, while the recipient's SMS is only 70 words long. So if I write a full length and send a short message, it will be a short message to me, and the other party will show that I have received two short messages, because he can't accept my length and can only cut it into two paragraphs.

I hope these answers are helpful to you.