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Downloading the original electrum from electrum.org is the best rather than using third party sites like Google playstore to download it for not to download the fake ones.
Download the Android version of Electrum that matches the smartphone specifications (armeabi/arm64) from the official site:Downloading the original electrum from electrum.org is the best rather than using third party sites like Google playstore to download it for not to download the fake ones.
https://electrum.org/#download; https://download.electrum.org/
Also, verify the PGP signature and make sure it matches ThomasV's public key or fingerprint:
https://raw.githubusercontent.com/spesmilo/electrum/master/pubkeys/ThomasV.asc
As an example:
After that, install the Electrum APK file manually on the Android smartphone.