Done it to 84, so now it is transmitting in True mode. NOW the code is entering gosub one as expected BUT not gosub two.
Changed the code to the following:
main:
gosub one
Serout2 tx,baud,["AT+CMGF=1",13]
Serin2 rx,baud,5000,main,[wait("OK"),i]
gosub two
goto main
As always code never enters label two which means it is not getting the required response. I attach my setup photo, though not very clear but the schematic is the same except the pin change to 10 & 12 instead of your 17 & 18.
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