ETS-6588 Wireless Desk phone allows the user access to voice communication on GSM mobile phone network with a SIM card. The Desk phone is suited for Home and small office use to communicate. It comes with two SIM Card Options. The Phone is Open and accepts any SIM Card provider in other words any SIM card is allowed. Small business with 1 -4 people General Home families use For the Elderly, Maids, and Kids at Home Community Phones An easy way for the elderly to keep in contact with their family as well as for families and businessmen to save on costs. It has a great battery life.