Who called from 6104657875

Showing on my caller ID as Sixtel, LLC.  I Googled that and it's a voice over IP company.  When you Google them it sounds like they call many places and the number changes to reflect the area they are calling.

they called me also and said he was from pp&l and was very rude wouldn't say why he was calling just tried to keep me on the phone

Just Received Call from Sixtel, LLC # 610-465-7875. Did not answer because i did not recognize
the caller ID. Thanks for your input.

Called but didn't leave a message.  Wally above said it was someone from PPL, and I think that's odd as I am a PPL customer.  If they needed something, why didn't they just call me from their regular phone number?

It's almost certainly one of those "Hey change your power generation company to us and we'll save you money!" telemarketers.