I apologize I missed the opportunity to reply sooner, Tojo1121. Generally a plan won’t change the type of signal you see but may affect the speeds. The areas you provided are both fairly well covered LTE areas. Does your phone fluctuate between LTE and 3G or are you only seeing 3G near your signal strength for the past two months?
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How to Fix Common iOS VPN Issues - Make Tech Easier This article will detail fixes to common VPN problems on iOS. Nonetheless, most tips will work just as well on Android. I personally use SurfEasy on my iPhone, which is a $3.99-a-month service, but there are quite a few other VPN services available – some free, with a cap on data usage (Ex. TunnelBear). These tips will work on those as well. How to Access a VPN on Your iPhone - dummies iPhone also supports VPN protocols known as L2TP (Layer 2 Tunneling Protocol) and PPTP (Point-to-Point Tunneling Protocol). You can configure a VPN on the iPhone by tapping VPN under Network, tapping Add VPN Configuration, and then tapping one of the aforementioned protocols.
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As VPN works within your internet connection so it depends on your internet/3G connection if protocols i.e. PPTP and L2TP are allowed or not or which will work fine. If you are able to connect with your Wifi but having issue with your 3G connection that means protocol is blocked.