Why does the newly bought Apple 6s only have ringtones, but there is no sound in text messages?

In the settings. Settings → Sound → SMS ringtone → Select a song. Did you turn on the vibration? I download and make songs for ringtones myself (there are them on itunes, but they are not practical. Easier to use synchronization assistant) → more functions → tools → ringtone production → song selection → editing → successful production → import into mobile phone.