Doesn't matter, you still carry your phone home with you and will reveal your location in this way. Doesn't work, LE can identify your new number based on the fingerprint of the collection of numbers that call you, or the fingerprint of outgoing numbers that you call. Thus, you are not the person with phone number 12345678 but the person who always calls 12345679 and 123456777 and 123456666 and 87654321 and 87654311 and 87564321. Of course to identify you in such a way they will need to pen register the numbers you are known to communicate with, but they have done this before to counter this exact technique.