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How to unlock your car using your mobile phone

Keys locked in car

By accident you lock your keys in the car and have a spare set of keys at home.
Call someone at home from your mobile but call their mobile phone.

Get them to press the unlock on your spare keys holding the key or fob close to their mobile phone.

Make sure your mobile is about a foot from your car and your car should unlock

I will test this with my mobile and land line and update with the results