The classic sum of obstacles and upheaval. Plans get disrupted and emotions run hot, so keep commitments flexible, avoid confrontation, and treat setbacks as redirections rather than defeats.
Sum 13 belongs to the group traditional readers advise avoiding, as it is believed to invite friction and fatigue. If you must use it, choose a number whose internal pairs are strong enough to compensate.
Add all 10 digits of the number, e.g. 099-296-9696 = 0+9+9+2+9+6+9+6+9+6 = 65, then read the total against the numerology table — this page covers sum 13.