It's trivial. You can buy a SIM outside Retiro for like AR$5, or in a proper store for maybe AR$10. Might take a little more finagling to find a micro SIM, as most phones are still on the old SIM standard.
Here's what will kill you: getting data. Under what circumstances are you relocating to Bs As? If you are official, like you will get a DNI and everything, great, otherwise, this is the problem area. Most prepago plans in Bs As price data at piratical rates, like...a AR$20 card may include say 5MB data (on Claro). You open Google Maps and there goes your data allowance. I haven't found a provider with a decent deal on prepaid data.
There is, of course, normal postpaid accounts with more reasonable data allowances and pricing, but you can't get a postpaid account without a DNI, usually. Occasionally, you hear about someone wandering into a Personal or Movistar store and the clerk giving them a plan and saying its no problem, but that's rare.
Alternatively, if you're company or something is sending you there, you can see if they can get a phone plan taken out in the name of someone else at the company, with the company guaranteeing the payments. Because getting the DNI takes forever anyway.
Here's what will kill you: getting data. Under what circumstances are you relocating to Bs As? If you are official, like you will get a DNI and everything, great, otherwise, this is the problem area. Most prepago plans in Bs As price data at piratical rates, like...a AR$20 card may include say 5MB data (on Claro). You open Google Maps and there goes your data allowance. I haven't found a provider with a decent deal on prepaid data.
There is, of course, normal postpaid accounts with more reasonable data allowances and pricing, but you can't get a postpaid account without a DNI, usually. Occasionally, you hear about someone wandering into a Personal or Movistar store and the clerk giving them a plan and saying its no problem, but that's rare.
Alternatively, if you're company or something is sending you there, you can see if they can get a phone plan taken out in the name of someone else at the company, with the company guaranteeing the payments. Because getting the DNI takes forever anyway.