какая страна с мобильной связью +121?

+1 – Североамериканский план нумерации (США, Канада и некоторые страны Карибского бассейна) . Далее:

210: Texas (San Antonio metropolitan area)
Created by split from 512 in 1992.
Three-way split in 1997 created 830 and 956.

211: Community Services Hotline (e.g., crisis line, United Way, etc.)

212: New York City (Manhattan except for Marble Hill)
Split in 1984 to create 718.
Overlain by 917 in 1992 and by 646 in 1999.

213: California (Downtown Los Angeles)
Originally covered the southern third of California; split to create 714 (1951), 805 (1957), 818 (1984), 310 (1991), 323 (1998), and 424 (2006).

214: Texas (Dallas–Fort Worth metroplex)
Split to create 817 (1953), 903 (1990) and 972 (1996). 214 and 972 were merged and overlain with 469 in 1999.

215: Pennsylvania (Philadelphia area including its suburbs in eastern Montgomery County and most of Bucks County as well as a very small portion of Berks County around the Hereford area, which is served by the Pennsburg 679 exchange.
Split to create 610 in 1994.
Overlain by 267 in 1997; a further overlay with 445 was proposed, but never implemented.

216: Ohio (Cleveland area)
Three-way split in 1997 created 330 and 440.

217: Illinois (Springfield, Champaign, Decatur, Urbana, Lincoln, and parts of central Illinois)
Split in 1957 to create part of 309.

218: Minnesota (Duluth, Moorhead, Thief River Falls, Bemidji, Brainerd, International Falls, and most of northern Minnesota)
Split in 1954 to create 507.

219: Indiana (northwest: Gary, Chesterton, Crown Point, East Chicago, Hammond, Hobart, Merrillville, Michigan City, Portage, Valparaiso)
Created in 1948 by split from 317.
Split in 2002 to create 260 and 574.

Возможно, звонок был со скайпа.