T-Mobile offers unlimited MMS as part of its Sidekick Unlimited plan.
For just $19.99 a month T-Mobile subscribers, owners of the new MMS-capable Sidekick Slide or Sidekick LX, will be able to send as many MMS messages as they want. All new customers to buy LX or Slide will be automatically placed on the unlimited Sidekick plan.
As for the existing ones, they will have to change their current plan manually.
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