Association representing all mobile operators worldwide, many regulatory authorities, many manufacturers

GSMA (GSM Association)

Law firms

Allen & Overy, Allens, Alston & Bird, Baker Botts, Bird & Bird, Brinkhof, Bristows, Clifford Chance, Cohausz & Florack, Freshfields Bruckhaus Deringer, Hogan Lovells, Hoyng ROKH Monegier, Keker & van Nest, Kirkland & Ellis, McGuire Woods, McKool Smith, Michalski-Hüttermann, Morrison & Foerster, Olswang, Paul Hastings, Perkins Coie, Powell Gilbert, Quinn Emanuel, Ropes & Gray, Samson & Partner, Taylor Wessing, Vossius, Weil Gotshal & Manges, WilmerHale, Wuesthoff & Wuesthoff

Network operators

AT&T, Deutsche Telekom, Docomo, Orange, Sprint, T-Mobile US, Telenor Sverige, Verizon, Vodafone

Manufacturers

Acer, Apple, Asus, Blackberry, Broadcom, Cellxion, Ericsson, Fujitsu, Guangdong OPPO, HMD Global, HTC, Huawei, LGE, NEC, Nokia, Samsung, Sony, Xiaomi, ZTE