Comment by stephen_g
Nokia has a pretty successful business in things like cellular base stations, carrier networking, etc. - for example they brought their joint venture with Siemens (Nokia Siemens Networks) back in-house by buying Siemens' part out, and that does a lot of optical network stuff (DWDM backhaul equipment, etc), already had a cellular base-station business but then also bought competitor Alcatel Lucent, and a lot of provider network stuff came in with that (like FTTH equipment on the provider side). They also got Alcatel's undersea cable laying division.
So they still have a bunch of valuable and successful businesses even though their consumer business went to crap.
So they gained a reputation for reliability/durability and pivoted to infra?