T mobile here
I have a family plan 1500 minutes for $79 for 2 phones. Nights and weekends free plus all talk betwen phones or anybody else who has t mobile is free. I got razors for free for everybody plus every year we can get a new phone for the new customer price which is usually almost nothing.
I also pay $9.99 a month which allows anybody on my family plan to text or picture message Unlimited.
They also have an awesome single plan now where you get 1000 minutes plus night and weekends free for $49.99 plus a free phone.
Whoops... almost forgot...you can CHANGE your plan up or down anytime you want with tmobile. I found this VERY valuable alot of times and was not STUCK waiting for a year to roll around . I know for a fact other plans lock you in or have a bunch of strings attached or money attached to do this.