Try unplugging it and leaving it for 5 minutes before turning it on.
Are you wanting to get a US IP address? If so you have no need of VPN and VPS's. Dongle may be your best option if you cannot get the IP address to change.
When you use the term "dongle" are you just referring to a mobile broadband USB modem? Or am I missing something?
I'm asking because I know some mobile broadband providers use Static IP's, right?
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