By the time they reach Phase 3, children will already be able to blend and segment words containing the 19 letters taught in Phase 2. Twenty-five new graphemes are introduced (one at a time).
Phonemes: j, v, w, x, y, z, zz, qu
Consonant digraphs: ch, sh, th, ng
Vowel digraphs: ai, ee, igh, oa, oo, ar, or, ur, ow, oi, ear, air, ure, er
Letters and sounds resources: http://www.letters-and-sounds.com/phase-3-resources.html