Yes but AFAIUI Mitnick was upset Shimomura had the full weight of the police on his side, right? He used techniques that shouldn't have been available to him
Interesting fact about Shimomura, he was a student of Feynman's
I think he didn't know cellular well enough and thought a wireless phone was unlocatable because it was mobile and not tied down to a landline. As a physicist, Shimomura would have known all about radio and signal. He just used old WW2 tech of radio triangulation to find the location of the cell phone radio transmitter. It didn't help that cell phones were rare back then and the signal of his cell transmitter frequency was standing out like a sore thumb.
Regarding the full weight of the police, Shimomura did have an easier time to convince the ISP and phone companies to give him access to the logs. He was able to ask the cellular company to locate the cell tower where Mitnick's cell phone connected and traced him to the general area. If Mitnick had been careful, he could have hacked into the ISP/phone companies and erased all his access logs.
Regarding the full weight of the police, Shimomura did have an easier time to convince the ISP and phone companies to give him access to the logs. He was able to ask the cellular company to locate the cell tower where Mitnick's cell phone connected and traced him to the general area. If Mitnick had been careful, he could have hacked into the ISP/phone companies and erased all his access logs.