That is wrong.  As has already been mentioned, a phase bypass ignores mitigation, meaning it deals extra damage, which is definitely helpful.  I've said this three times now, and you've basically ignored me every time.

Lets see If I cant make this simpler and easy to understand.

Lets say your targets shield is mitigated by 50% (an easy number). You shoot it for 100 damage.

1) Without shield bypass: your shot is mitigated 50%, dealing only 50 damage.

2) At 30% bypass: Your damage is split into 70 (which gets mitigated to 35) and 30 (bypassing the mitigation), for a total of 65 damage.

50 without shield bypass vs 65 with 30% shield bypass. Those are the numbers and that is why shield bypass works.

Now earlier someone said "If the target dies without shields, the shield bypass had no effect because (x)hp + (y)shields = (z) damage." It is true that one must still do (z) damage to destroy the vessel, but that statement is untrue because shield bypass does not allow you to destroy a vessel by doing less than (z) damage, it increases the rate at which you approach (z) damage. IE it does not make LESS damage required to destroy, it INCREASES the rate of damage.

Normal Shot (100)

                                     = 50 Damage                                                       Total= 50 Damage
100------------------------->((( Shields: 50% Mitigation

Shield Bypass Shot (70+30)

                                    = 35 Damage
70-------------------------->((( Shields: 50% Mitigation

                                                                                   =30 Damage         Total= 65 Damage
30----------------------------(((-------------------------------->III Hull       

Anyone still not getting this?

** I should also mention that I only used the "split damage" scenario to keep things simple. In game, it does not actually split the damage, but it literally means "30% of the time your missile will bypass the shields entirely". What that really means is out of 100 shots (from assailants, bombers, SBs, Sentinels, pm platforms etc.), 30 will deal their FULL DAMAGE to the hull and armor. No other weapon can boast FULL DAMAGE because all vessels with shields have a MINIMUM 15% mitigation AT ALL TIMES. So any other weapons fired at a target will suffer a minimum 15% off their damage due to mitigation. This is the MAIN reason why Vasari are the best at killing enemy capital ships, as you focus fire on the cap, its mitigation maxes out reducing the damage being dealt to it (up to 70%, but generally 65%), but phase missiles allow strikes on cap ships as if they had no mitigation at all.

Also, one should note that 30% bypass is not the maximum percentage, Vasari subverters can increase the chance phase missiles will bypass, effectively increasing damage a lot. Its kinda like Cielos' designate target, but specific to a weapon type.

Normal missiles are affected by mitigation even when the shields are depleted / down.

This means that a phase missle's bypass % is the chance that it gets an unmitigated hit on the hull.  It isn't just a 30% chance to hit the hull, it is a 30% chance to hit the hull and do OVER DOUBLE DAMAGE because it is unmitigated.  When the shield is down, you still have a 30% chance to do this extra damage.  It doesn't matter how much armor you are hitting because armor is a constant -- the more damage hits the armor/hull, the better because it is all uniformly reduced.

Because you are not getting it, let me run something like your example to demonstrate:

Lets assume target has 2240 shield, 50% armor reduction, 2000 hull, 60% mitigation, and is not regenerating.

Phase Missiles:  100 damage per cycle

30%: 15 damage to hull (30x 0.5)
70%: 28 damage to shield due to %60 mitigation (70x 0.4)

Shields will be down in 80 cycles.  Hull damage will be at 1200 (15x80) at this point.

30%: 15 damage to hull (30x 0.5)
70%: 14 damage to hull (70x 0.4 x 0.5) (Mitigation AND Armor) 
Total hull damage per cycle: 29

Remaining 800 hull will be destroyed in 28 more cycles for kill time of 108 cycles (80 shield up + 28 shield down)

Non Phase Missiles

40 damage to shield due to %60 mitigation
Shields willl be down in 56 cycles

20 damage to hull (100x 0.4 x 0.5) due to %60 mitigation AND 50%armor

100 cycles to destroy 2000 hull.  Total kill time of 156 cycles (56 shield up + 100 shield down)

Of course this is a simple example and not the exact combat mechanics, but it should illustrate the concept of what people are trying to explain to you.

If you don't believe me, get a stopwatch, and time how long it takes 10 Assailants to kill a cap with and without the 30% phase tech.

EDIT:  LOL --  I missed that there was a page 2 already and more good explanations.  Will leave this example up anyhow.

then u have mysterious lum damage  that will remove shield without firing