PPPOS not working on Quectel M95 and M66 module

hello @rahul.mahakalkar and everyone,
Before 20 days i was work on PPPos and at that time it will work fine,but now its not working…please check below logs and let me know how to resolve this issue,thanks.
actually i am using esp idf esp 32 controller and quectel m66 module,when PPPos start than crash esp32 and reboot…after PPPos started (after ATD*99# cmd),

I (818) pppos_example: Module: Quectel_M66
I (818) pppos_example: Operator: “Vodafone - Gujarat”
I (818) pppos_example: IMEI: 864502039974886
I (818) pppos_example: IMSI: 404242306491057
I (878) pppos_example: rssi: 16, ber: 0
I (928) pppos_example: Battery voltage: 3878 mV
I (1118) pppos_example: Modem PPP Started
I (1118) pppos_example: PPP state changed event 259
I (1118) pppos_example: PPP state changed event 262
I (1218) pppos_example: PPP state changed event 263
C:/Users/Frank/Desktop/esp-idf/components/freertos/queue.c:1448 (xQueueGenericReceive)- assert failed!

abort() was called at PC 0x40088441 on core 0
0x40088441: xQueueGenericReceive at C:/Users/Frank/Desktop/esp-idf/components/freertos/queue.c:1448 (discriminator 3)

Backtrace:0x4008501f:0x3ffb8b40 0x400856bd:0x3ffb8b60 0x4008938a:0x3ffb8b80 0x40088441:0x3ffb8bf0 0x40088591:0x3ffb8c30 0x40132b2d:0x3ffb8c50 0x40132c49:0x3ffb8c90 0x400856c5:0x3ffb8cb0
0x4008501f: panic_abort at C:/Users/Frank/Desktop/esp-idf/components/esp_system/panic.c:330

0x400856bd: esp_system_abort at C:/Users/Frank/Desktop/esp-idf/components/esp_system/system_api.c:106

i think this happen due to GPRS Network register fail,i try AT+CGATT=1… for GPRS netwok rtegister but it will got error AT+CGATT=1,please let me know why this error are come,i change my SIM card and 2 days ago i recharge mt Vi simcard,than also error get…

i check on Qnavigator and try to start PPP but error come environment are not set due to GPRS n/w not register …i try standalone MQTT but got error when i open socket using AT+QMTOPEN,so i think that this all issue are come bcz of GPRS n/w not register…so please let ,me know how to register GPRS n/w.
thanks & regard

Dear PiyushGiri
Please check internet of the sim card is working or not(you can confirm with by adding same sim card in mobile).
You can use below commands to activate the PDP
please refer the AT command application note for details of the command.

Dear @rahul.mahakalkar
i check internet are working fine in my SIM and also i change my sim card also,ans check below AT command in Qnavigator IP didnot get…please check below logs,
[2021-06-09 18:13:27:050_R:] AT+CGATT?

[2021-06-09 18:13:27:050_R:] +CGATT: 0

[2021-06-09 18:13:27:050_R:] OK
[2021-06-09 18:14:00:688_S:] AT+QIREGAPP?
[2021-06-09 18:14:00:703_R:] AT+QIREGAPP?

[2021-06-09 18:14:00:703_R:] +QIREGAPP: “internet”,"",""

[2021-06-09 18:14:00:703_R:] OK
[2021-06-09 18:14:19:835_S:] AT+QIACT
[2021-06-09 18:14:19:851_R:] AT+QIACT

[2021-06-09 18:14:19:851_R:] ERROR
[2021-06-09 18:14:43:569_S:] AT+QIACT=?
[2021-06-09 18:14:43:581_R:] AT+QIACT=?

[2021-06-09 18:14:43:581_R:] OK
[2021-06-09 18:15:31:961_S:] AT+QILOCIP
[2021-06-09 18:15:31:967_R:] AT+QILOCIP

[2021-06-09 18:15:31:967_R:] ERROR

and please let me know how to resolve this issue,also i want to know in Home menu in qnavigator inside registration information network registration are registered but GPRS network registration are not registered,i want to know different between this both n/w registration ,
sometime it will work fine but sometimes not work ,please let me know what is a main reason for this happen and how to resolve this.
thanks & reghard,

Hi Piyushgiri:
You can use AT+CGREG? to check whether the module is registered with the PS network.
If it failed to register the PS network, you need to confirm whether the SIM card is overdue and whether the signal is poor.