A short code is a telephone number made up of four, five, or six digits. Businesses use short codes to send high-volume messages via MMS or SMS to customers including alerts, codes for two-factor authentication, and marketing messages. Allowing its customers to block or blacklist all short codes led T-Mobile subscribers who enabled the feature to complain to the carrier that they weren't receiving two-factor authentication codes, important messages from their financial institutions, and more.
Leaked internal T-Mobile memo reveals that a feature used by 1.5 million subscribers is being removed
The resulting flood of calls made by T-Mobile customers who blocked or blacklisted short codes became a headache for T-Mobile's customer service department. T-Mobile will still allow customers to block individual short code numbers following the removal of the option to block all short codes.
Starting this coming Tuesday, August 17th running through Thursday, August 19th, T-Mobile will send out text messages alerting its customers to the change. If you're a T-Mobile customer and never blocked short codes from appearing on your mobile device, you won't notice any change.
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