Look folks - you DO NOT need a flat rate box - in fact it will cost MORE than shipping FIRST CLASS if the package weighs13 ounces or less. At one pound, the cost of priority mail is $4.95 and you do NOT need it in a flar rate box.
dont know if it would fit in a small one. http://palmaddict.typepad.com/palmaddicts/2007/06/how_i_use_my_pa_1.html that guide says how to make calls. its not a phone by default