There is a strong possibility the land lines will be busy or out of service. Past disasters have shown texting is sometimes possible when land and cell lines are not available.
For non-emergency communications, use text messaging, e-mail, or social media instead of making voice calls on your cell phone to avoid tying up voice networks. Data-based services like texts and emails are less likely to experience network congestion. You can also use social media to post your status to let family and friends know you are okay. In addition to Facebook and Twitter, you can use resources such as the American Red Cross’s Safe and Well program (www.redcross.org/safeandwell).
Ref. FEMA Blog September 21, 2011 FCC & FEMA: How to Communicate Before, During & After a Major Disaster