The HSS (Home Subscriber Server) is the concatenation of the HLR (Home Location Register) and the AuC (Authentication Center) â two functions being already present in pre-IMS 2G/GSM and 3G/UMTS networks.
Three Days Grace's music has been described as post-grunge, hard rock, alternative rock, alternative metal and nu metal. Their self-titled album mostly uses the sounds of alternative metal and post-grunge. However, on their second album One-X, the band had more guitar solos and a more melodic sound.
Three Days Grace garnered the attention of many record labels after the release of their demo, largely due to the song, I Hate Everything About You. Eventually, Three Days Grace signed with Jive, and began recording their debut album in Massachusetts. The single I Hate Everything About You was released in promotion for the album.