"I'd better call you back later."
"We seem to have a crossed line."
"I can't hear you very well."
"We seem to be breaking up."
Can you hear another person?
"Sorry about that. I just went through a tunnel."
"My battery is almost dead."
"I think we got cut off."
"I think there's a problem with the network."
"The signal is very weak here."
"Can you speak up? The line's not very good."
"I need to charge up my phone."