I doubt that the second-hand mobile phone I bought can send text messages. Who can help me verify it?

Sending text messages on mobile phones is not a particularly bad function. Basically, a mobile phone can do it. Well, you can try sending yourself a short message, or you can call 10086 to ask some business questions, and then a short message will be sent to you naturally. If you are prompted to grade, you can give it a try. If it doesn't work, you can send one to your friends or family for a test. Now there are so many smart phones at all price points.