SIM800a cannot detect the card

The SIM800A development board module cannot detect the SIM card. Please check yourself for the following problems:

1. The card is not inserted correctly. Send AT CCID to see if there is any card information returned.

2. The data manual should have an error code. You can self-check the cause of the problem corresponding to the error code

3. Check the SIM card circuit to see if there is any soldering, and the SIM card data Try removing the capacitors on the line

SIM800A Introduction:

SIM800A is a quad-band GSM/GPRS module with a castle hole package. It has stable performance, compact appearance and high cost performance, and can meet the various needs of customers.