Silvery - 5:52 pm on Sep 15, 2009 (gmt 0)

If you have a bona fide reason for using one number across multiple listings, then you could do so without incurring problems. Consider major chainstores and hotels which use toll-free numbers, for instance.

Caveat to this is - if you don't have an actual street address for each of your listings, you may end up getting penalized for trying to spam the index.

Ideally, your outlets should already all have listings within Google, and you're now simply trying to update/enhance/standardize them. It's suspicious if you're trying to bulk-add a bunch of businesses all at once with identical phone numbers - that could attract a human review of your submissions. If you are validly opening a bunch of new locations, you need to also be getting your info into many yellow pages data aggregator databases as well, such as Acxiom and InfoUSA. Those feed also into Google Maps, at which point it's a lot more trustworthy looking.

[edited by: bakedjake at 4:30 am (utc) on Sep. 16, 2009]
[edit reason] No specific searches, please and thank you. [/edit]