Hello there I am on AT&t I am wondering if I can get some voices from the LA area or all over the country. Of how their services when traveling. I'm probably under the unlimited plan plus. Have unlocked Sony Xperia xz-2 and bringing over a note 8 from AT&t. I lost money if you do the Netflix thing can you pay the difference to get the 4K highest version Netflix just pay the difference. Thank you all for in advance.