Which cell sevice you have doesn't matter. You just need to download the US WU app on your phone.
To do this you just have to change the country of your play store/app store.
Is this not because of very high import taxes which were previously offset by the low official exchange rate? Now the official exchange rate went from 350 to 895 and your machine went from 320 to 800.
You can create a new account every time and never pay WU fees. I do it once per week usually. My closest WU always has cash and never has lines so for me it works out really good.