Okay, lets look at this by carrier.If you go on Sprint's network, Ting could do this:5 phones ($30) + 2000 shared minutes ($35) + 6000 shared texts ($14) + 3 GB of shared data (you currently use 2.25GB ($60) = $139 a month + tax.A few notes, texts over 6000 cost 1/4th of a penny. So, if you sent another 4K texts, you'd have an extra charge of $10. Alternatively you could start using google voice to text, which is entirely free (as it goes over wifi or data). This can be harder than it sounds, my wife refuses to do it despite how easy it is. Anyways, this is about the best deal you can find overall. Switching to Ting would require new phones though as the network is CDMA and your phones are GSM. Ting does NOT subsidize phone purchases so you'll be paying full price.If you stay on AT&T's network, you can go with either Straight Talk or Net10. Net10 will throttle your data at 1.5GB on a line (which you won't hit) and Straight Talk is more ambiguous about it, but people report throttling around 2GB of data. So, 5 lines with unlimited talk/text/and data as described above run $225 plus tax. If you find that you're the kind of guy who frequently needs customer service though... you may come to hate these companies. You can bring your existing phones.If you are okay on T-mobile's network, Solavei would be the choice. Each line would have unlimited calls, texts, and 4GB of HSPA+42 data (then throttled to 2G beyond that limit). If you signed up first, then signed up your wife under you, then signed up the other 3 under her, both your line and her line would get a $20 a month discount. So, your and her line would both be $29 a month, and the other 3 would be $49 a month. Grand total is $205 plus tax. If you go this route, let me know as I might be able to get you your SIM cards for free.If you want to use Verizon's network, which appears to be the best by you, you actually want to use Verizon itself. Family Share Plan with unlimited talk/text/plus 8GB of shared data is $130 for the first 2 lines, with $40 each additional line. Grand total of $250 and they'll subsidize your new phone purchases.ETA: Roaming. Ting runs on Sprint and roams on Verizon. Net10 and StraightTalk do not roam, so you just have AT&T. Solavei runs on Tmobile and roams on AT&T. Verizon runs on Verizon (duh) and roams on Sprint. None of these companies charge a fee for roaming if they offer it.ETA2: If you decide on Solavei, please PM me. There are a few things you have to do to ensure that 2 lines get the $20 monthly discount. Like use unique emails for each phone you register.