San Fierro Early OnMission=0


        
            
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            San Fierro Early OnMission=0
Note: To learn more about Duping in general, check out the Duping FAQ.
Normally you would get the OnMission=0 call for duping Jizzy (Cutscene) using the SF Stadium, on the way back from Photo Opportunity, directly before dating Katie and the actual dupe.
This new strat gets the OnMission=0 call using Trucking, after the Badlands races, on the way to Are You Going To San Fierro?. Getting the call with Trucking is faster, since you don't have to wait around for the mission to run out like you do with the SF Stadium. This strat also allows you to consistently get a police car after 555-We-Tip, which is fast.
The call used for this is the call that creates the Are You Going To San Fierro? marker, but isn't actually required to unlock the mission, which can be started by entering the invisible mission trigger.
However this strat also requires you to carry the call through several missions, which costs a bit of time:

Are You Going To San Fierro?
Wearing Flowers In Your Hair (requires specific timing at the end)
555-We-Tip (allows moving in the cutscene and getting a police car)
Deconstruction (allows moving in the cutscene)
Photo Opportunity

Carrying an OnMission=0 call through a mission
For this, the OnMission=0 call doesn't have to be held through the entire mission, in fact that probably wouldn't even work, since cutscenes often drop button presses, which would drop the call. Instead, carrying a call through a mission usually works like this:

Start the mission with the OnMission=0 call
End the call to get OnMission=0 (but not accidentally dupe the mission), which allows the phone to ring during the mission
Before the mission ends, starting holding the call again, so that passing the mission sets OnMission=0 and gives the OnMission=0 call back

This process is similiar to doing the Duping Setup, except that the Setup relies on the programming of the mission marker not setting OnMission=0 immediately to gain a call during the mission, while carrying a call through a mission already starts with an OnMission=0 call.
Depending on the mission this can be easy to do or more difficult, mostly depending on how the cutscenes work and when the mission passes. For example Are You Going To San Fierro? passes right after CJ is on foot again, so the phone automatically rings just before the mission passes, so all you do is just press the hold phone button. However Wearing Flowers In Your Hair for example has cutscenes at the end that require you to time the call so it doesn't ring too early, but also not too late (which depending on how well you do also costs some more time since you have to wait with skipping the cutscene).
Sometimes you may also want to not answer the call when ending it (answered as in this call will be used up and not ring again), which can be achieved by letting go of the call during an interior cutscene (which simply cancels the call) or by getting a hands-free call and invalidating it by shooting. A hands-free call is achieved by letting go of the call outside/on foot just before a cutscene, where skipping the cutscene gives CJ back control while he is answering the call, so you can shoot to invalidate the call (which means even though it may sound answered, it's actually still in the call queue).
Having a phonecall while on a mission (which normally should be impossible) also allows for moving in cutscenes, since ending a call gives CJ back control.