Telkomsel
Use APN "chatbox", UDP on port 53 will work.
Indosat / Mentari
Option #1:
Configure the proxy as 10.19.19.19 on port 8081. Set connection mode to HTTPS. Configure the YF server as "mmsc.indosat.com:443/cgi-bin/legacy.cgi@SERVER".
Option #2:
Configure the proxy as 10.19.19.19 on port 8080. Set connection mode to HTTPS. Configure the YF server as "mmsc.indosat.com:443/mms@SERVER" or "mmsc.indosat.com:443/mmsc@SERVER".
Option #3:
Configure the proxy as 10.19.19.19 on port 8080. Set connection mode to HTTPS. Configure the YF server as "mmsc.m3-access.com:443/mms@SERVER".
XL
Option #1:
Configure no proxy. Set connection mode to HTTP on port 80. Configure the YF server as "wap.xl.co.id/SERVER".
Option #2:
Configure no proxy. Set connection mode to HTTP on port 80. Configure the YF server as "wap.lifeinhand.com/SERVER".
Option #3:
Configure no proxy. Set connection mode to HTTP on port 80. Configure the YF server as "SERVER@wap.xl.co.id".