Oh on the Disappeared episode about this the police said they couldn't get into his cell phone because it was password protected. Isn't there a way to get around this?
It appears they were finally able to get into his phone late last year (the “Disappeared” episode about Martin premiered on June 10, 2018):
Apr 21, 2019
“[SBM]
Investigators initially believed the key to solving Martin’s 2016 disappearance could lie within his locked iPhone.
The phone — left behind in Martin’s Boone apartment along with his laptop, iPad and bank card —
remained an enigma until late last year when investigators gained access to the device’s data.
‘They retrieved a lot of data from the phone that has led to a lot of conversations,’ said Roberts, who lives in Kernersville with wife, Abbie. ‘They looked at names, numbers, locations, and they’ve been able to follow up on some leads from the information.’
Boone police contacted Apple in 2016 to override Martin’s passcodes on his devices, but hit a roadblock.
Apple representatives declined to help, citing a 2016 precedent where Apple resisted the FBI’s demand to crack an iPhone linked to the fatal shooting in San Bernardino, Calif., in December 2015.
Police obtained a search warrant for any data Martin had stored in the iCloud, but found nothing.
After finally gaining access to Martin’s phone data, a thorough exploration provided frustratingly little direction to what had happened to Martin, his father said.
’They found nothing definitive,’ Roberts said. ’There were some contacts that were previously unknown that they followed up on, they looked at GPS mapping functions, but they didn’t find anything more than they had before.’” (BBM)
Easter Sunday marks third year since Martin Roberts disappeared