Hello, I already have the plan "$50 UL Talk Text Web (100 MB at 4G)" but actually I would like to upgrade my plan to "$70 UL 4G Web, Talk and Text - $70/month".
My doubt is if I could upgrade my plan by paying the diference of US$20 or I need to pay all the amount of US$70? And how can I do it?
There is only five days that I got this plan.
Already thanks!