TTGO-T-Call board- Blynk- GPS Modul

Hi Guys,
can someone help me out. I use a TTGO-T-Call board with GSM capability.
I was able to connect a temperature sensor to the board. So far everything works well with Blynk.
Now I would like to connect an additional GPS sensor via the TX and RX interface.
The pinouts show that, for example, the TX / RX (26/27) are already used by the modem

I connected simple the Neo-GPS module to the Serial TX and RX pins, but that in turn causes conflict
with the USB port.

My question here would be which pin can I use or would it be even not better to go through the hardware serial Port?
The instructions show that this is an ESP32 can handle “Hardware serial”.


//Definition Hardware Interface
HardwareSerial Serial1(1);

void setup() {
//Starten der Schnittstellen
//Serial1 auf Pin 34 und 35


A post was merged into an existing topic: Ttgo t-call (esp32 + sim800l) with NEO-8M GPS