He had less contact but IIRC on May 30 he tried to call her but she was at work. She texts back: just saw I missed your call. I'm at work. call me/you tonight?
They also text about pictures and random stuff...about 16-18 times after May 26. They very well could have spoken on the phone several times a day or none at all
Then
June 2nd
several calls between Arias and Alexander in the early morning hours:
Arias called Alexander four times between 1 a.m. and 3 a.m.
These calls were all very short, the longest 17 seconds.
Alexander called Arias twice during the 3 a.m. hour:
The first call was just under 18 minutes, the second about 41 minutes.
Arias called Travis at 4:03 a.m. The call lasted 2 minutes, 48 seconds.
At 5:39 a.m. Arias bought $15 worth of gas outside of Yreka
By 8:04 she's renting the car in Redding
June 3
Monterey
Breakfast with Darryl
Then at WAMU depositing money at 10:15am
Arias called Alexander twice:
A 17-second call at 12:57 p.m.
A 2 minute 50 second call at 1:51pm
Pasadena, California
At 8:16 p.m., Arias calls Alexander. The call lasted 2 minutes, 9 seconds.
At 8:31 p.m., Arias goes to a CVS pharmacy.
At 8:34 p.m., Arias calls Alexander again and the call lasts 49 seconds
Between 8:42 and 8:46 p.m., Arias makes gas purchases at Arco.
She's gassed up and on her way to Mesa with a knife and a gun
Perfect example.

You assume he tried to call her on May 30. Based on what? The fact she texted him she'd missed his call? You've seen the texts,
you know she manufactured online stuff up the wazoo, know that she was intent on documenting the lie of TA still planning on visiting her, and yes, he texted her all of 20 words after May 26, early AM, which was significantly different for him. As were the terse one liners he responded to her with.
So why assume he actually called her?
Another example of context. 20 words distributed over those 15 or whatever texts. That already changes what might be inferred from the number of texts alone. Then add-- she initiated all the texts. Then add- the texts were almost all "clustered" into 2 exchanges on 2 days, neither exchange lasting longer than 10-20 minutes, max, iirc, and one of the 2 began with her sending one of her frigging "accidental" texts. I think his contribution to the latter game of hers was "no," "no, don't see it," and "no" or some such.
This is the perfect example and laying out of what I mean by context. Do I think my interpretation is the only accurate way to view this text record and what it means? Nope. But IMO the only grounded interpretations are those that take into account how sparse that text record was after May 22, really, but let's say after May 26, especially in comparison to other times, and especially times after the 2 had fought.