To view the Message Center number, from the Messages settings screen, tap Text messages.
Tap Message center to view the number.
To adjust the text/picture message limit, from the Messages screen, tap the Menu icon.
Tap Settings.
Tap Delete old messages > Text message limit. Adjust, then tap OK.
From the Settings page, tap Multimedia message. Adjust, then tap OK.
To restore default settings, from the Messages screen, tap the Menu icon > Settings > Menu icon > Restore default settings, then follow the on-screen prompts.