Dear @mikekgr
Just received the TTGO T-Call yesterday.
I updated the Blynk_GSM library to v1.0.2 to enable GSM/GPRS and WiFi to run simultaneously. Already tested OK with TTGO-TCall as well as normal ESP32/ESP8266.
Also update the link here
Hope you find it useful as well as use it somehow somewhere.
Regards,
KH