These are all I could find from Wikipedia and other sources. If you’re aware of any other ones please share them in comments and I’ll add them to the list.
Carrier Email to SMS Gateway
7-11 Speakout (USA GSM) [email protected]
Airtel (Karnataka, India) [email protected]
Airtel Wireless (Montana, USA) [email protected]
Alaska Communications Systems [email protected]
AT&T Enterprise Paging [email protected]
BigRedGiant Mobile Solutions [email protected]
Bell Mobility & Solo Mobile (Canada) [email protected]
BPL Mobile (Mumbai, India) [email protected]
Cellular One (Dobson) [email protected]
Cingular (Postpaid) [email protected]
Centennial Wireless [email protected]
Cingular (GoPhone prepaid) [email protected] (SMS)
Claro (Brasil) [email protected]
Claro (Nicaragua) [email protected]
Comcel [email protected]
Cricket [email protected] (SMS)
Emtel (Mauritius) [email protected]
Fido (Canada) [email protected]
General Communications Inc. [email protected]
Globalstar (satellite) [email protected]
Helio [email protected]
Illinois Valley Cellular [email protected]
Iridium (satellite) [email protected]
Iusacell [email protected]
i wireless [email protected]
Koodo Mobile (Canada) [email protected]
LMT (Latvia) [email protected]
Meteor (Ireland) [email protected]
Mero Mobile (Nepal) [email protected]
MetroPCS [email protected]
Movicom (Argentina) [email protected]
Mobitel (Sri Lanka) [email protected]
Movistar (Colombia) [email protected]
MTN (South Africa) [email protected]
MTS (Canada) [email protected]
Nextel (United States) [email protected]
Nextel (Argentina) [email protected]
Orange Polska (Poland) [email protected]
Personal (Argentina) [email protected]
Plus GSM (Poland) [email protected]
President’s Choice (Canada) [email protected]
Qwest [email protected]
Rogers (Canada) [email protected]
SL Interactive (Australia) [email protected]
Sasktel (Canada) [email protected]
Setar Mobile email (Aruba) [email protected]
Suncom [email protected]
T-Mobile (Austria) [email protected]
T-Mobile (UK) [email protected]
Telus Mobility (Canada) [email protected]
Thumb Cellular [email protected]
Tigo (Formerly Ola) [email protected]
Tracfone (prepaid) [email protected]
Unicel [email protected]
Virgin Mobile (Canada) [email protected]
Vodacom (South Africa) [email protected]
Vodafone (Italy) [email protected]
MobiPCS (Hawaii only) [email protected]