another trick here...not sure if its work for all...but you can try it...
situation - your key inside and doors are locked
the spare key at home...doesn't matter how far...you actions:
1. you're calling home, the PHONE models (ur and the one at home) should be the same.
2. the one at home take the spare Key, set it close to mobile and push open button.
3. in the same time keep ur mobile at this end close to the car...and SURPRISE! doors are opened!
at least you can try it...hope it'll be useful for you X5 World!

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Davud X5/110 - PITBULLET
Options: X5 4.4i, 07/2000
Modifications: 16:9/DVD Player “Absolute”/Style 177/BT Kit & Nokia Cradle for 6310i/Wheel Arch Moldings/4.6i Spoilers on Front & Rear bumps/35% Tint on Rear/Predator Angel Eyes/Full Black Grill/Xenon light on Low Beam/Facelift Tail lights/X-Pipe + MG-RACE Cat Replace/Green Filter/ Bosch Super4 Spark Plugs /Chrome Dash Rings/ Individual Black Carbon Roundels/Jlevis Silver Carbon Fiber Pedals.