SMS short code
21900
Last activity 1 day ago
0 community reports1 verified registry assignment
Who uses short code 21900?
HKairport Rewards
Canada
- Program website
- https://www.hkairportrewards.com/en_US/contact-us
- Support phone
- 85221887849
- Registry checked
- September 9, 2026
Source: Canadian Telecommunications Association (txt.ca). A legitimate registry assignment does not prove every message claiming to use that brand is legitimate.
Community SMS reports
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