Smart phones, cell phones--do they pulse?

[Guest guest]

Hoping someone can help me with this. I was househunting yesterday and the

realtor had left her cell phone in her car (turned on). While in the house I

picked up a brief pulse on my electrosmog detector twice, both times while in

the corner of the house near the driveway. The Wifi and cordless phones were

turned off in the house, so I am trying to figure out where this pulse was

coming from. The nearest tower is at least a mile and a half away. Could it

have come from the phone in her car? Does anyone know if these newer generation

phones send out periodic pulses like this, and would they reach that far into

the house if her car was in the driveway? Or is it more likely that it came

from another source? I could find no other explanation inside the house for the

noise I heard on my meter. I am doubtful it came from the nearest tower since

it's so far, but who knows? Any help would be appreciated.

Thanks,