Over 70% of our users are using a smart phone to browse our ads. People on their phones love to tap the text or phone call buttons on the ads to quickly & easily contact the ads. We feel that's one of the reasons our traffic keeps hitting records week after week - we're delivering the user experience that people want.
We have no plans to allow advertisers to start hiding the phone numbers (and respective buttons) that are a vital part of our interface & user experience. Instead, we recommend using a service to setup a special phone number just for your ads like Google voice or Text Pigeon that can deliver text messages to your email inbox.