ETF charges - what can I expect?

Question

I understand I've already asked about how much the ETF itself would be, and I understand that it's $350.
I just want to know; are there other charges? Like taxes? Surcharges?
I've done a little looking around and found that several people have had some additional sums of money added to their ETFs.
I plan to terminate my contract at the end of the month, since the number that's under contract is one I'm not actually using, and I don't want to keep or pay for a number I don't use. (Long story short; I neglected to look more into the termination aspect after transferring my prepaid number over to my Note 3, so I wouldn't have to use a new number, my 14 days ran out, and now I have the first month bill and an ETF to work out.)
I'm not angry with Verizon, actually. It's my own fault for not understanding how things work, but now that I do, I can be more careful about how I go about my next phone purchase in the hopefully distant future (only purchased the Note 3 because my old phone was on the fritz; no sound, jammy keys, and it was a 3 and a half year old Intensity II.) and I'm actually grateful for the experience.
So... I live in New York, can ANYONE tell me what kind of taxes and surcharges I could expect from my ETF?
I can understand if there's taxes, which would make the $350 become $378, with the 8% tax thing in mind (unless NY uses a different tax rate for these kinds of things as opposed to the typical "buy something in the store for $10, total comes to $10.80" tax idea.)
Would there be ANY other kind of taxes I can expect to have added on?

Answer 1

Okay, thank you for answering!
Now, just so I understand, would that 12% be on my ETF bill, or my actual phone bill?
Just so I know to have the money ready!
It's not that I'm leaving Verizon for good; I'm using a prepaid number and would rather use my phone on a prepaid plan than a contract one. I've been pleased with my Verizon experiences so far, so I don't see a reason to leave :3