I use SpoofCard for contact with scammers. Not only do I get to choose the phone number they think is calling them, but you can record the conversation!
It's really not smart, or safe to give your real phone number to people you meet online. Sometimes you may be curious, though. Are you really prepared to change phone numbers when the calls from a scammer, or even a stalker, or pervert, never stop?
Be careful! We do not encourage use of this service for any illegal activity. Please use the phone number spoofing capabilty, and conversation recording in accordance with any applicable laws.