J4RZ Last Calls and text

These are the last calls on Rebecca's phone, and then the texts she received after she died.  
Several unidentified texts from Arizona. Why??

July 12

17:44PM Rebecca texted Jonah
17:44PM Jonah texted Rebecca
17:45PM Rebecca texted Jonah
17:46PM Jonah texted Rebecca
19:34PM Rebecca CALLED Jonah
19:39PM Adam CALLED Rebecca
20:41PM Rebecca texted Jonah
20:41PM Rebecca texted Jonah
20:43PM Jonah texted Rebecca
22:41PM Nina texted Rebecca

July 13
09:50AM Sister XZ texts Rebecca
09:50AM Sister XZ texts Rebecca
13:32PM CN texts Rebecca
16:17PM Sister XZ texts Rebecca
17:15PM Medicis VF texts Rebecca
19:24PM 602-741unidentified text to Rebecca from AZ
20:08PM 480-684unidentified text to Rebecca from AZ

July 17 
12:21PM Sister MZ-L texts Rebecca
12:21PM Sister MZ-L texts Rebecca
July 20
16:37PM Sister MZ-L texts Rebecca
16:37PM Sister MZ-L texts Rebecca

July 27
16:46PM 602-369 unidentified text to Rebecca from AZ