hi today I sent funds from the smarphone bitcoin app to electrum, I chose BTH, ........
First of all, there's no coin called BTH.
We have BTC (Bitcoin) and BCH (Bitcoin Cash).
What was the application you used?
Didn't you download the application from bitcoin.com?
Bitcoin.com trick newbies and sell the fake bitcoin (bitcoin cash) to them instead of bitcoin.
If you have sent BCH to electrum (as mentioned by NeuroticFish above), download Electron Cash from
its official website and import your wallet into electrum.
If you know the address, get its private key and import it into electron cash.
Electrum's seed is recognized by Electron Cash. So, it's possible to import the wallet using the seed phrase too.