When a girl doesn't reply to your texts, or answer the phone, realize this will happen with at least 4 out of 5 phone numbers. More like 8 out of ten. This is normal even for very talented pua's.

Cold approaching is the hardest way to get a girl invested in you. Be willing to work hard. Don't hate the girl, you WILL see her again at a party and if you sent her a hateful message you will blow your chances
to seduce her on the second run. Can't tell you how often I've scored a girl on the second meeting by chance. "So sorry I didn't text you back!"