Michael Walker (14 January 1947 – 27 September 2018) was an English mathematician who was instrumental in developing the standards that apply to

mobile telecommunications Mobile telephony is the provision of wireless Telephony, telephone services to Mobile phone, mobile phones, distinguishing it from fixed-location telephony provided via landline phones. Traditionally, telephony specifically refers to Telephon ...

and particularly in respect of the

SIM card A typical SIM card (mini-SIM with micro-SIM cutout)A SIM card or SIM (subscriber identity module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are u ...

References

1947 births 2018 deaths Members of the Order of the British Empire Vodafone people Academic staff of the University of Tübingen Scientists from Winchester Deaths from bronchopneumonia Deaths from cancer in England Academics of King's College London Alumni of Royal Holloway, University of London English mathematicians Place of birth missing Place of death missing Officers_of_the_Order_of_the_British_Empire {{UK-mathematician-stub