1953, and was operational until July 1, 1996. The number was chosen at a time when phones were large and had rotary dials, and it was specially adapted for Sweden. Unlike most other countries the Swedish rotary dish was labeled 0 to 9, instead of 1 to 0, and the phone number was considered to be easy to remember and easy to dial in darkness. The caller did not have to consider the number of zeros dialed as a connection would be established imminently after the first four. Pulse dialing Another reason the number 90 000 was chosen was because the relative ease you could call it without a dial dish through the pulse dialing system. The system worked as follow; you lift the phone handset, push the hookswitch in the pulse train sequence 10-paus-1-paus-1-paus-1-paus-1. When the sequence have been signalized the switchboard will execute the finalizing parts of the connection. For the new number 112 corresponding sequence will be 2-paus-2-paus-3. An advantage with phone-number 90 000 was the low statistical plausibility that the number would be generated by mistake. The statistical probability for a loose connection, or other types of electrical fault, to achieve the number series 90 000 is very low compared to the number series 112. When the British telephone company BT Group introduced 112 to the United Kingdom the number of erroneous calls caused by electrical faults to be 8 million per year, which after technical measures was lowered to 200 000 per year. In relation British BT received about 25 million emergency calls in year 2001. Criticism In 2011 criticism was directed towards SOS Alarm on the basis that the operator was considered to have misjudged callers emergency situations. In four cases had the persons in need had died as ambulances was sent too late or not at all. In one of these cases the operator was indicted for involuntary manslaughter, but was later freed in district court. In the judgment, however, the district court criticized that ambulance had not been sent on basis of the indications the patient had provided. Organisation During a normal year SOS Alarm handles 3.8 million calls and 975 000 health matters. During 2017 about one-third of the 3 million incoming calls concurrence non-emergency matters and about 100 000 were prank calls. See also 112 (emergency telephone number) 113 13 (telephone number) 114 14 (telephone number) Vårdguiden 1177 9-1-1 Emergency