Data consumption is totally irrelevant when it come to throttling. Throttling is the action of reduce network speed during network congestion e.g at peak hours etc and you can barely notice except during streaming video/youtube etc. And finally, MVC ...
By experience, with every carrier I’ve used, the issue always came from Public Mobile whether it was port-in or port-out. With other carriers, transfers usually work easily and without issues. With Public Mobile, however, it has never worked smoothly...