NO CARRIER in SIM 808 module

#1

I connected a SIM 808 module with a sim card to a pc via ftdi module
I am able to receive calls and sms but every time i try to dial a number using
ATD<“phone number”> it says NO CARRIER
The sms that i try to send every time also dont get delivered

Please Help!!

#2

Hi Shubhang,
No carrier means it is not getting dial tone.
Are you adding semicolon at the end of ATD. Like ATD123456789; ?
Can you check and make sure your power supply is not dipping when you generate a call?
Are you able to receive incoming call and talk for a longer duration?

#3

yes i am able to receive calls for long duration…And power supply also seems to work fine… i am using a 5 volt 2 amps phone charger as supply…is there any AT command to check weather i am getting a dial tone ???

#4

also for the sms :
i typed AT+CMGF=1-----OK(RESPONSE)

then AT+CMGS="+phone number"

then it asks for the text with a symbol “>” on the screen.
after entering text and pressing CTRL+Z or ECS key it replies with OK
But the text is never delivered…is this also because of NO CARRIER problem?

#5

Are you reducing 5V to 4V on board before reaching the module?
Most probably you dont have balance in your SIM card, check it once. Or try a different SIM

#6

no 5 volts is fixed …i tried with a charger of 5 volts and 4 amps also… and with 2 different sim cards and both of them have sufficient balance…should i try changing the gsm antenna or the board itself??
i also found the smsc number using AT+CSCA?.. but the no carrier problem still persists

#7

Module is getting 5V?
What is the voltage you are measuring on VBATT pins?

#8

yes module is getting 5 volts and voltage on VBAT pins is 4.11 volts
Is there anything else that i should try or just replace the entire hardware?

#9

This is a strange problem :slight_smile:
You can replace hardware and try if its available

#10

Hello,

Can you show your module? Is it have signal LED? How about it is blinking pattern? Power LED blinking or not? What is the output value for AT+CBC command? Please send me these information.

#11

Hi @Shubhang Please check whether your SIM is having sufficient balance to make calls or send text message…

#12

Sir,i connected m590e gsm module to Arduino with separate power supply…Gsm make call correctly…But while sending message it showes no carrier message… Please help me sir

#13

Please open separate thread for you topic