its the same price.
They don't charge for 4g tethering, they charge for tethering period. Its just a perk that 4g tethering is enabled with their hotspots app, cuz other tethering apps that are free for rooted people don't support 4g sadly.
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I use wireless tether which is free in the market and it works fine with 4G, just need to be rooted.
If any one knows of a newer version that works as a normal wifi hot spot please let me know...