You are getting some incorrect information here, but there are also more questions that need to be asked. First, are you planning to live in one of the units, or is this strictly for investment purposes? If it is for an investment, then an FHA loan would not be an option.
Do you have a ballpark purchase price you are thinking of? If so, what do you have for a down payment and closing costs, and how much would you have in reserves?
A 2-4 unit building is residential, whereas about 4 it is commercial from a financing stand-point. it is not true, as someone mentioned, that you cannot finance multi-family buildings any more. There are certain cash-out restrictions, and you can't do it as a no income verification loan (unless there is a regional lender who will allow it), but you can finance a 2-4 unit as either a conventional or FHA loan, depending on certain other circumstances as I mentioned above.
I am surprised that the only local loan officer gave you no information, just a "call me". Why not ask around for referrals from a friend or business associate for a referral? I would recommend a mortgage banker who can also broker, so that you have the most options.