Re: why cant i send text messages from my galaxys5?
Hello. Welcome to Android Central.
Has this started happening lately, or the device is new.
Are you sending plain text or mms.
Try Message app - Menu - Settings - Input Mode, automatic - and Creation mode - Free.
It may also be some apn or mms settings.
Also - Connections - More Networks - default Messaging app.
There can be other reasons I can't think of, so come back.