need help with anime?! i forgot the name, please help?

[Michelle]

I remember watching this trailer about this girl in the future or somthing and she said somthing about her standing at a place and there was no servise on her selfphone, until she got to spot and her phone started ringing, but she loved a boy and she was chosen to go out to space to protect earth?! and she had short brown hair! yeahh thats all i remember she looked like though, but they said somthing about meeting again and then they would be happy