Using multiple internet connections at the same time?

Question

Photo

Situation:
I am a photojournalist. Very often it is required to send photographic materials to the editorial office from places where mass events take place, which means what? That's right, the channel is clogged, the connection is unstable, --> the transmission speed is low. I saw this stray from my fellow operators:

Naturally, I began to think in the direction of the simultaneous use of several modems in order to increase the stability of the signal and increase the transmission speed. But specifically the above stray is only suitable for video equipment.
After a two-day unsuccessful search for solutions, I appeal to you - is there a hardware (very desirable) solution to my problem?