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The sender number/name for SMS can be easily changed and should not be relied on for _anything_. Twilio even offers that as a service (as do most bulk-SMS prov

• toast0 4y ago
  That greatly depends on telco policies at the destination. In the US, alpha senders aren't allowed. Shortcode (5 or 6 digit numeric senders) spoofing is highly frowned upon to the point where you can't send from the same shortcode with multiple aggregators. Other countries vary between anything goes, aggregator takes anything in the sender field, some high profile names are checked, or all sender names need to be run through the telecoms regulator and validated by the aggregator and cell carrier. Of course, there's (usually?) no customer id transparency between the carrier and the aggregator, so if there's a misconfiguration at the aggregator, one customer may be able to send with a registered sender of another customer.