510-306-4001

Unrecognized #. Calls, leaves no message -- the sure sign of a ripoff artist.

Called it back, answering machine said it was a call center for charitable and political organizations...

Multiple calls in a week, does not leave a message

Left a message but it was "Hello, may I speak to [name]...?" -- asking for me as if they didn't just hear my voicemail greeting... then they were silent for 30 seconds before hanging up. I could hear people talking in the background like it was a call center pen.

I just received a call from this number.......no message! Caller ID shows Sierra Club?

Called cell, left no message

Received a call from this number a short time ago......no message! Caller ID shows Sierra Club

Another call from Sierra Club!

4 calls in a minute! I missed them all, was away from my phone, no message left.

Between 6-17 and 1-18 we got 20 calls from Sierra Club caller ID, using 231-732-2081 (Michigan Area Code).  Now they seem to have moved to high-rent Silicon Valley.  If they can afford that, they don't need our donation, or yours, either, IMHO.  But they're a non-profit, so being on the do-not-call list is of no help.  Block both numbers!

Another charity scammer looking for your money.  CID says "Sierra Club".  Could even be an imposter.

This number keeps calling me.   Two times already today on 8-30-2018.  Remove my cell phone from your listing please.

I answered by mistake, thinking I knew who it was, but they said they were calling from Sierra Club. Pretty obnoxious though, trying to verify my address before I’d agreed to continue the call.

510 306 4001. Just called twice. My cell phone. I don't answer unknown calls. No message. Nothing. Has to b a scam.legit callers leave info.

510 306 4001. Just called twice. My cell phone. I don't answer unknown calls. No message. Nothing. Has to b a scam.legit callers leave info.

510 306 4001. Just called twice. My cell phone. I don't answer unknown calls. No message. Nothing. Has to b a scam.legit callers leave info.

510 306 4001. Just called twice. My cell phone. I don't answer unknown calls. No message. Nothing. Has to b a scam.legit callers leave info.

510 306 4001. Just called twice. My cell phone. I don't answer unknown calls. No message. Nothing. Has to b a scam.legit callers leave info.

Didn't leave message.

They call at least once a day but don't leave a message. I don't answer, but I'm sick of them.