tingnan mo sa message settings.. iba2x kasi per device ang plastada ng settings eh.
hanapin mo po message centre.
refer to this:
List of SMSCs in the Philippines
Globe Philippines
+6391702
+6391703
+6391704
+6391708
+6391709
+639170000017
+639170000020
+639170000118
+639170000130 (globe only. not for TM)
+639710000247 (also for TM)
+639710000240 (also for TM)
note: kung tama ang message center ng sim mo. meaning may ibang dahilan kung bakit hindi ka maka sent.. isa lang to sa possible fix/troubleshooting.