T-Mobile has begun sending out notices to its existing customers as the carrier axes its grandfathered plans, forcing customers to move to new plans. The fourth bigger mobile carrier in the United States, T-Mobile allowed customers to enjoy the perks of their legacy plans after the company had stopped offering them but it will now be officially retiring the plans, beginning November 1.

Customers with existing plans that will be force-migrated to new plans do not have to take any action. They will receive a letter informing them of the changes to their rate plan and receive a text message upon activation of the new plan.

"We appreciate your business and are committed to providing the best mobile experience for you. We listened to customer requests to simplify wireless, and have responded by restructuring all of our current plans to be simple and straightforward-- and with unlimited voice now included in all plans," a copy of the letter from T-Mobile read.

"With this plan you may pay more for your service, but you'll continue to enjoy access to the latest smartphones, and T-Mobile's advanced nationwide 4G network with LTE, rolling out in 2013," the notice stated, as the carrier tried to match a plan similar to the old plan of the subscriber.

The mobile carrier has been playing the role of being the "uncarrier" since its announcement in March that it will be simplifying its offerings and will be removing contracts. Since then, T-Mobile stopped offering old plans and pushed the new plan called Simple Choice to consumers that does not come with any contract.

"Maintaining thousands of rate plans is the norm in the industry, but we think it creates unnecessary complexity. Simple is better, which is why we're reducing the number of older plans in our systems. We're giving customers on these plans the opportunity to choose a plan that best meets their needs. For the vast majority, their plan will provide similar or better features at a comparable price," explained T-Mobile via a statement acquired by tech website Endgadget.

Based on the letter from T-Mobile, it is giving existing customers who want to opt out, to cancel their new plans until February 1,2014 without having to worry about incurring any early termination fees or penalties.