T-Mobile says it's working on bringing robocall service to the iPhone
Today, T-Mobile launched a new anti-robocalling feature for selected Android phones. The carrier also says it works with Apple to bring the technology to the iPhone.

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T-Mobile's technology was developed with Comcast and attempted to curb the growing problem of robo calling in the United States. The function is based on a combination of industry standards, as described in Reuters :
The function uses an industry standard, called "Secure Telephony Identity Revisited (STIR) and Secure Handling of Asserted Information using toKENs (SHAKEN ), "or STIR / SHAKEN, to identify authentic conversations across the networks.
The T-Mobile feature works by marking authenticated callers as "verified", which theoretically makes it easier for users to avoid robotic callers and other spam calls. John Legere argues that T-Mobile is the "first" operator to "cross industries" to protect consumers against robocalls:
"Robocalls and spam calls are an industry issue and we need to stay in order to keep consumers protected "Today, we're the first to cross industry lines to do just that," said John Legere, CEO of T-Mobile.
Legends presumably refer to the fact that T-Mobile's feature is the first to work across multiple networks such as It authenticates conversations between its own network and Comcast, which will be available to both T-Mobile and T-Mobile from T-Mobile customers, as well as Xfinity Voice telephone service users.
As for iPhone users, T-Mobile claims that it works with Apple to implement support for the device, but the iPhone has added call blocking and identification features as part of iOS 10, but these features are not as powerful enough to combat robokals and spam calls
According to data from YouMail quoted by Reuters, 5.2 billion robo columns were placed last month alone. Fraud accounts for 40 percent of these calls. T-Mobile's new service comes as the FCC has threatened to get involved, unless carriers have strengthened their efforts to prevent robokall.
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