French phrase
Si la connexion échoue, contactez-moi par ~.
Meaning
If the connection fails, contact me by ___.
When to use it
A polite request to contact someone if connection fails. The blank names the contact method, such as email or phone.
Example dialogue
Si la connexion échoue, contactez-moi par e-mail.
If the connection fails, contact me by e-mail.
D'accord, je vous enverrai un e-mail si ça arrive.
Okay, I will send you an e-mail if that happens.