Tmobile web2go (unlimited web) plan?

I have this old plan that I pay 10 bucks a month for and I get unlimited web. I have also been using an iPhone for the past 3 1/2 years with this plan and its been go to me since tmobile iPhone users was bumped to 3G /4G. I have a 4s and it shows 4G. So I'm wondering I have 4g? And would I have LTE. This isn't a smart phone plan. This plan is only for non smart phone phones. When i use a tmobile smart phone, i get prompted to upgrade my plan. I tried using Hulu and Netflix and it plays flawlessly. Thanks

Added (1). So I can add tethering with that plan? So I guess I have a 3G+ maybe 4G for a cheap rate then?

T-Mobile doesn't have true 4G, it's just high bandwidth 3G but they show it as 4G. That's why on some phones they never get a 3G connection, it either shows 2G or 4G. However, Netflix and other streaming sites should play with no problems whatsoever over the 3G/4G signals. I was told that they were supposed to get true 4G later this year but that was just through the grapevine.

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