Borders as in for example the Australian - New Zealand border if each have different phone companies.
They are very far away on account of both being surrounded by lots of ocean
The two countries are actually quite close afaik aren't they?
Edit: what's 4000 kilometres, there must be coverage over that channel though? My globe is printed without a New Zealand :-(.
I have the blockchain_headers file, it's at 43,466kb so I guess it's done something haha
You probably have a really slow internet speed of your 4G network, even it should be from 20Mbps to 50Mbps, and blockchain_headers file should be downloaded in less then a minute if Electrum is connected to good server. It is possible that your blockchain_headers file is somehow became corrupted during download, so if the problem continues it is best to close Electrum and delete that file (only that file), start Electrum and give it some time to sync again.
I've done it on 3G and 4G should be higher if he can get a connection there. Also the 4G should be rated at.
@OP, try and test it by going to ("system" >) "about phone" > "status" and see what the signal strength is in dBm (mine's at -90dBm and 11asu for example as it's an old sim).
If you can't get it to work, the best thing you can probably do is wait for your broadband to be set up.