All writs is for current investigation. FBI could theoretically compel Apple to produce a single backdoored phone that will be exchanged with evil maid attack with original device when they have ongoing investigation and a warrant.<p>But unless you can point at - This is Bill, we are targeting Bill, we have a warrant for Bill, we need 1 phone that we will make sure becomes Bill&#x27;s - All Writs cannot help.<p>If Bill mails order a new iPhone they can compel apple store to give him compromised device. They could probably put FBI team presenting themselves as store employees in every store if Bill is high value enough target and expected to buy iphone today.<p>But they cannot say - compromise all of SF Bay Area iphones because we expect one of them to be bought by Bill.<p>Some of the lawyers here correct me if I am too wrong.