Do you mean download the folders, and then put them into multimc/minecraft launcher, or something, and then add them all manually?
If so, it would be possible BUT very complex as you would need:
Access to the file downloads for the mod pack
Knowledge of which forge version they are using
And then ofc downloading/transferring files using mobile device.
My advice would be if you have a laptop, go to somewhere with free wifi and download the modpack there.
Or take a USB stick to a library and download the modpacks onto that using their computers.