What I'm saying is, read the comments on the board "Data Usage on iPhone 5s". 2 GB of data might be fine with your current phone, but apparently with the iPhone you will need to turn off a lot of things (in other words, you'll need to dumb down your new smart phone) or purchase a way larger GB plan. That's why I haven't bought a 5s yet.
Yes you should spend some time and read up on all the 5, 5c, 5s rampant data use threads a little. There are some pretty IRATE customers out there, who like you upgraded from the 4s to one of the newer "5" models and are now being charged for excessive data use. There are surely an even larger percentage of (unsuspecting) customers who have just accepted the higher $$$ data plans, and monthly over-charges.
In a nutshell... the iphone 5 models on LTE will consume at least 6-10x the amount of cellular data as your 4s... with the latest iOS version, running iOS factory default settings. So what you have to do is deactivate LTE, and turn off all the "smart phone" creature comfort features, and essentially dial back your 5/5c/5s to a dumb phone. It requires you to manually turn on the cellular data option for those apps that really need it.
The 5s and 5c on AT&T LTE network do not behave this way. I know for a fact, having compared co-workers phones directly with my 5c on Verizon. Those co-workers run their phones on the iOS default settings as feature-rich smart phones, with ATT LTE network engaged... and do not have this problem.
My wife has a 4s for 2.5 years now. I have spent a lot of time comparing the two phones... and honestly, I don't think the benefits of upgrading outweigh the serious drawback. If I wanted a feature rich smart iphone 5c or 5s on LTE... I'd go with AT&T... If you go with Verizon you will need at least a 6-10G data plan... possibly WAY more depending on how you use the phone/network.
My findings here...
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