Yes Having a regional landline/fixed telephone number is Good signal for local SEO. And putting mobile number will not going to hurt your SEO. Here is the awesome post on Citation ( your problem 
Hope this help you out...
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Posts made by SanketPatel
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RE: Does displaying a mobile number for business hurt local SEO?posted in Image & Video Optimization
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RE: Multiple businesses under the same physical addressposted in Image & Video Optimization
Have you read 13 point in that blog post ? Please find below:
13. If I run two businesses from the same address, could I simply add a suite number to differentiate?
Yes, but you'll also need to have different phone numbers for each business, even if it's just a forwarding number. Google uses phone number as their unique identifier for the business so they will merge businesses with the same phone number and assume it's a data error instead of two separate businesses. I have seen this happen with clients in the past, and it just can't be fixed without two different phone numbers.