My parents are disappointed. Because while going through my phone they found videos of me texting in class. What do I do? I already swore I wouldn't do it ever again, what can I do to regain their trust and make them no longer disappointed in me?

Here's how to keep a bad situation from getting worse.

First,  speak the truth if you don't, you'll only undermine any remaining trust your parents have in you.  So be honest and specific about details.

Avoid justifying or minimizing what happened or what you did.

Always remember that "an answer, when mild , turns  away rage.  Proverbs 15:1

Second,  Apologize..... Expressing  regret over the worry, disappointment, or extra work you caused is appropriate and may reduce the severity of your punishment. However, your sorrow must be sincere.

Third,  Accept the consequences......taking responsibility for your actions is a sign of maturity.  Your best option may simply be to work at regaining your parents' confidence.    Proverbs 20:11.

Remember,  your parents have the responsibility to exercise reasonable control over  your actions.  Thus the Bible speaks of  "the commandment of your  father"and the law of your mother".  Proverbs 6:20.

If you want your parents to give you more freedom or in this case give you your phone back......

Build a record of abiding by their rules.

And, strive to make obedience apart of your identity - your inner sense that tells you who you are and what you stand for.