Looks like a GSM handset, just go to a retail location to assign a new mobile # and a SIM card. Currently the two largest providers for GSM are Cingular and T-Mobile. It is up to you to decide. The phone won't work with Sprint/Nextel, Verizon, Altel.
How do you get service to a cell phone if the model doesn't belong to any carriers? I want to get the Sony Ericcson 790a but I have no idea how I would get service to it.
I'm also confused as to why this isn't a very commonly asked question. I spent hours trying to find this out but apparently this is something the average person knows? Just seems wierd to me that I'm the only one in this situation, and when I asked my dad and brother about it they had no clue that cell phones without carriers even existed.