Actually my concern isn't with getting a phone into or out of Argentina (I routinely take two with me for different purposes), but whether the phone I gift can be used by my friend. As I say, there was a fuss a while back about a new law aimed at phone thieves to keep stolen phones from being allowed access to in-country service. Somehow it involved registration of IMEI codes.
It was never clear to me whether this would prevent service to a phone brought "unregistered" into Argentina. I routinely obtain SIM cards for temporary use without problems but I'm not sure this is quite the same thing as a resident Argentine using the phone with their usual provider.
If anyone has had experience gifting or has knowledge of the law, it would be interesting to know (& thanks).
Well, a little googling and I may have answered my own question (yes, all lines must be registered):
¿Todas las líneas telefónicas de celulares tienen que registrarse?
Sí. Todas las líneas telefónicas de celulares tienen que registrarse. Se incluyen las líneas que tienen contratación prepaga, pospaga y mixta que pertenezcan a personas, empresas u organismos.
Resolución 8507-E/2016, Anexo, Art. 1. Ente Nacional de Telecomunicaciones. https://www.argentina.gob.ar/justiciacerca/registrolineacelular
Four methods of registering, online/in person, are provided. If I am understanding correctly, if an Argentine user obtains a different phone, all that is needed is to advise his or her service provider of the new IMEI: Si la línea de telefonía móvil cambia de titular, hay que informarle a la empresa de telefonía móvil para que haga el cambio de registración. In my specific case I presume it would be needful only to have previously registered the phone as a result of obtaining a temporary SIM card (DNI holder) in order to facilitate my friend's "cambio."
Or maybe it is not needful to provide my friend with a pre-registered phone. I may be overthinking this. In either event I appear to be covered.