Full disclosure, Speedify is an advertiser on this site. I recently tried their trial access and was impressed by its ability to solve my traveling internet issues (at least partially) so that I can upload files on-the-go using various connections.
Basically this allows you to combine bandwidth / internet connections (called bonding) together for faster speed. They cannot be from the same provider so my usage will be using FREE cafe internet access in addition to my mobile hotspot for combined throughput.
On my Macbook I use an external, extended range wifi adapter plus the internal wifi adapter to take advantage of two different networks. At home where I have one main internet line and a backup line I can do one via wired connection, another via another wired connection or use wifi without much additional equipment.
Plus, its also a VPN as well so you get that added functionality while traveling when needing to access something local in the USA (like netflix, or P2P).