T-Mobile is good if you use Family Plan. For example, $25 per line for 4 lines or $22 per line for 5 lines.
Line 1: $50 -------------(unlimited talk, unlimited text, 500MB of 4G speed, unlimited 2G speed)
Line 2: +$30 --------------(unlimited talk, unlimited text, 500MB of 4G speed, unlimited 2G speed)
Line 3: +$10---------------(unlimited talk, unlimited text, 500MB of 4G speed, unlimited 2G speed)
Line 4: +$10---------------(unlimited talk, unlimited text, 500MB of 4G speed, unlimited 2G speed)
Line 5: + $10--------------(unlimited talk, unlimited text, 500MB of 4G speed, unlimited 2G speed)
$10 upgrade for extra 2GB at 4G speed
$20 upgrade for unlimited at 4G speed
Line 1: $50 -------------(unlimited talk, unlimited text, 500MB of 4G speed, unlimited 2G speed)
Line 2: +$30 --------------(unlimited talk, unlimited text, 500MB of 4G speed, unlimited 2G speed)
Line 3: +$10---------------(unlimited talk, unlimited text, 500MB of 4G speed, unlimited 2G speed)
Line 4: +$10---------------(unlimited talk, unlimited text, 500MB of 4G speed, unlimited 2G speed)
Line 5: + $10--------------(unlimited talk, unlimited text, 500MB of 4G speed, unlimited 2G speed)
$10 upgrade for extra 2GB at 4G speed
$20 upgrade for unlimited at 4G speed