I was trying to find information regarding if it would be more cost beneficial for us to switch to the M, L, XL plan versus our current plan. 

We only have 3 smartphones and always have $250+ bills (average about 15Gb/month), but I keep seeing ads on tv for 4 lines sharing 20Gb of Data at $80/month.   If I do the math right, $80 plus the two $25 phone payments we currently have via the Edge program, is only $130, so I'm trying to make sure we're not paying almost double what we could be paying. 

Thank you for your reply.