@asyousay, I found this article
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Federal Bureau of Investigation Special Agent Kevin Boles testified Thursday, Feb. 21, that the cellphone belonging to Charles "Chase" Ray Merritt connected to a cellphone tower several times in the near vicinity to the high desert location that prosecutors said the bodies of a Fallbrook family of four were buried in shallow graves.
Boles' testimony focused on the movement of Merritt's and Joseph McStay's cell phones around the time of the family's disappearance.
Boles showed the alleged path that Merritt's phone took Feb. 4, first connecting with a cell tower at 9:36 a.m. and connecting with three different towers through 9:44 a.m., allegedly heading north on Interstate 15. From 5:48 p.m. to 9:32 p.m. that same day, Boles testified that phone calls to Merritt's phone appeared to be sent directly to voicemail.
According to the phone records, Merritt's phone connects again for the first time in the Upland area, then later in the Los Angeles area, finally back to the Rancho Cucamonga area and again there is no call activity from 3:54 p.m. to 9:17 p.m. when the phone pings near Limonite Road near I-15.
Boles said Merritt's phone pings at 10:46 a.m., Feb. 6, near the intersection of Mojave Drive and Interstate 15 near Victorville and hits on a cell tower from 11:30 to 11:52 a.m. and later at 1:30 p.m. in the same area that prosecutors said the family was buried.
After court was dismissed for the weekend, testimony resumed Monday, Feb. 25, with only an hour of testimony recapping his earlier report.
FBI agent testifies on Merritt, McStay cellphone locations