I have this adafruit-feather-huzzah-esp8266: https://learn.adafruit.com/adafruit-feather-huzzah-esp8266/pinouts
and I want to connect a Fona board. But I am not certain which pins have the aforementioned software serial pins necessary to make the required connections. https://www.arduino.cc/en/Reference/SoftwareSerial
from the Fona tutorial: https://learn.adafruit.com/adafruit-fona-3g-cellular-gps-breakout/arduino-wiring
which pins on the adafruit-feather-huzzah-esp8266 should I use for pin: "TX connects to digital 3 (9 on Leo/Micro, 10 on Mega) "
where the feather doesn't have this a pin3. similarly, which pins correspond to RST and RX?