@sasetcolombia You need to use unused IO pins. For example the IO2、15、18、19....... This can be seen in the schematic diagram

@jimh
Hello, pins above 34IO can only be used as input

@tcccorp 1. To set the local SMS center: AT+CSCA=""+ Press Enter, return OK. For details, consult your carrier.
2. AT+CMGF=1: Set the SMS mode to TEXT.
3.AT+CMGS="phone number"< enter >, set the receiver phone number, then return: ">",
Send desired content, such as "Send Massage Test!" You don't need a carriage return at the end,
After editing the SMS message, send the message in hexadecimal format 1A (1A is the key value of CTRL+Z, which tells the module to send the message.
You can also send 1B, that is, "ESC" to cancel the operation.) After the sending is successful, the module returns +CMGS: 15 to confirm the successful sending.

@papbo What is your current ESP32 version? Try upgrading?

@jimh
5V DC and USB can be recharged

@jpvonoy
pinMode(25, OUTPUT);
digitalWrite(25, LOW);

The new firmware fix optimizes some features.

Update button function

reference

Yes, crystal burrs cause the problem.It has now been fixed in the latest version

Hello, the code has been fixed. The ESP32 Pico option is available.