Add an additional barrier to accessing the contents of your phone by using a passcode.
Trans women of color are often killed by those who are closest to them. A great deal of violence against women is intimate partner violence. You have a right to privacy. Use a strong 6 digit passcode on your smartphone and do not give the passcode away.
Do not hand your phone to an immigration officer at the airport if it is unlocked. The Electronic Frontier Foundation states that searches of your phone at borders are unconstitutional and require a probable cause warrant. The ACLU’s Know Your Rights at Airports says that laptop and phone searches are currently contested, and if you are forced to unlock your device you should record the badge number, name of the agent and agency and file a complaint with that agency.