Will the SMS be lost when the phone is restarted? And some photos will be gone?

You mean to restore the factory settings ... in that case, SMS, address book and software installed by yourself will be emptied, so make a good backup before restoring the factory settings or brushing the machine. The photo is in sdcard, so it won't affect it.

Restarting the phone is similar to turning it off first and then on again, which has no effect on the phone.