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Great question, mithunla! When it's added on to individual lines it's $15. However, if every line on the account has it, we would change your plan to the One Plus Family plan which would include the feature. In that case, it would only end up being $10 a line vs $15.
T-Mobile ONE™ Plus states:
ONE Plus gives you up to 20GB of 4G LTE mobile hotspot data and you can activate unlimited HD streaming. You’ll also get 2x data speeds in 210+ countries and destinations, Voicemail to Text, and Name ID. All these benefits are available on any new or existing T-Mobile ONE™ line for just $10 more per month when you add it to every talk & text line on your plan (a $5 discount off the $15 regular price).
Thank You Amanda. This makes it clear.