I need a phone number and address in Philadelphia. I don't need any
staff just somone to answer the phone and address. Like a virtual
office.

Gap,

I found the following web site:

[ http://www.a-1messagecenter.com ]
Claims to provide both receptionist and mail address services

Note that their web page made no mention of postal services, but
"Beth" assured me by phone that they will provide customers with both
a phone number and an address in Philadelphia, if requested. They can
be reached at (888) 437-3600.

I also did a search on http://www.superpages.com (a Yellow Pages-type
online directory) and found the following list of services in the
Philadelphia area:

[ http://yp109.superpages.com/listings.phtml?CID=7389AD040E2&AL=&C=Message+Receiving+%26+Forwarding+Service+&T=philadelphia&PG=L&STYPE=S&R=N&S=PA&NA=&PM=000d600b&LC=15&PI=1&MC=1&CB=&PP=
]
Yellow pages listing of "Message Receiving & Forwarding Service"
category in Philadelphia
(warning: some of these listings are general advertisements not in PA)

Note that I called the "Superior Answering Service" listed on the
above page at (215) 952-6000, was told to call their main office at
(215) 788-0125, and then got the same "Beth" on the line at A-1
Message Center! So, it looks like these folks have multiple company
names.

I hope this helps you set up your business!

/ephraim