According to TmoNews, there are changes in the works for T-Mobile plans including unlimited mobile to mobile calling for all T-Mobile phone owners with plans at $49.99 a month or more.

Family Plans

• New promotional myFaves plan for $89.99 that includes 1800 minutes, unlimited nights and weekends, unlimited mobile to mobile and my Faves.
• Adding 500 additional minutes to the $99.99 and $129.99 FamilyTime Plans at no extra cost.
• For the $119.99 and $149.99 myFaves for families plans, T-Mobile is adding 500 minutes, and we are lowering their prices by $10.

Family Allowance change

• The introductory period for Family Allowances is now ending, and T-Mobile is now changing the price to $4.99 per month per account for new customers. 
  

The changes are expected on April 15.

T-Mobile has been losing customers to Boost and other pre-paid services lately.