AT&T's no-contract subsidiary Cricket Wireless is launching a new plan on Sunday, April 17. It offers unlimited talk, text and data for one smartphone line for $70 a month.

In fact, Cricket says that plan goes down to just $65 a month with a $5 credit if customers use Auto Pay. The carrier is going after T-Mobile customers with this new offer:

T-Mobile charges at least $25 more each month for its Simple Choice Unlimited Plan for one smartphone line on a smaller 4G LTE network. Very Uncool. Plus if you join the Cricket Nation now, we'll give you a $100 bill credit when you switch from T-Mobile.

While you do get unlimited data with this new plan, Cricket will cap your LTE download speeds at 8Mbps and your 4G speeds to 4Mbps.