Okay smart people, help me figure out which is best option. I'm having a hard time. Current Plan: A&TT grandfather unlimited 22% corporate discount mostly in the Cleveland, Ohio and NYC/New Jersey area. Often do 400 mile road trips between Cleveland & NYC, so I don't want broken down in the middle of Pennsylvania zero cell service. Haven't had coverage or drop call issue with AT&T. I average about 1.6 GB in Data usage a month, now because I work from home, but who know what will happen in the future if I change jobs. Nation 450 Rollover 39.99 Unlimited Talk 20.00 World Connect 3.99 Data Unlimited 30.00 Total after discount & taxes 87.26 /month Still using Iphone 4 want to upgrade to iphone 6 . I want to stay with GSM network cause I do travel out of the country often, so that leaves me comparing AT&T vs T-mobile. Unless I'm wrong CDMA now works too, I'm outta loop on improvements. 22% corporate discount with At&T 11% taxes Option 1 : AT&T with 2yr Contract Subsidy Nation 450 w rollover $ 39.99 Data Unlimited Grandfathered $ 30.00 World connect $ 3.99 Unlimited Texting $ 20.00 ATT Plan after Discount & taxes $ 87.23 a months Iphone 6 128GB $ 399.99 Upgrade Fee $ 40.00 Option 1: Today's Total $439.99 + $87.23 = $527.22 Option 2 : AT&T with 12 Next Plan Plan Do I lose Grandfathered unlimited data? Don't thinks according to ATT website. If I do this before September 30, I might get little something for iphone 4 trade-in, but I'm not sure about this Nation 450 w rollover $ 39.99 Data Unlimited Grandfathered $ 30.00 World connect $ 3.99 Unlimited Texting $ 20.00 ATT Next Plan after Discount & taxes $ 87.23 a months Iphone 6 128GB $ 42.50 for 20 months Option 2: Today's Total $42.50 + $87.23 = $129.73 a month Option 3: T- Mobile Iphone 6 128GB Upfront fee $ 199.99 Monthly Iphone cost $ 27.08 1GB Data plan $ 50.0 T-mobile Plan w Taxes $ 85.56 Option 3: Today total $209.99 + $85.56 a month Which should I choose. People say T-mobile is cheaper, I don't see the different on monthly basis but if do the calculation based on 2 yrs. Option 1: Att Iphone $527.00 Subsidy cost Att Plan $2093.52 (24 months) Total $2620.74 Option 2: Att Next Plan Iphone $850 (20 months) Att Plan $2093.52 (24 months) Total $2943.52 Option 3. T-mobile Iphone 849.91 (24 months) T-Mobile Plan $1,200 (24 months) Total $2049.91 Okay this is better, I see the big picture. AT&T Next plan cost too much, forget that. So it comes down to $2,620 AT&T vs $2,049 T-Mobile. The questions I'm asking myself now? Do I risk giving up AT&T Grandfather unlimited? Even though I don't use it now, but I might need it in the future. Will T-mobile really slow down my speed if I go over 1GB? Should I pay more for the 3GB at $60/month, which would make 2yr cost $2,289? If I went with T-mobile, is the $570 saving in cost really worth it, if I get poor coverage service. I don't anybody with Tmobile to ask if they have service issues in Cleveland & NYC/NJ. Is there something else I'm missing, that makes T-mobile better. or another GSM carrier.