To get through is to survive a hard stretch — or to reach somebody by telephone. Two senses about making it to the other side.
The surviving sense is warm and very common, so getting through the week is what people say when the week is bad. The telephone sense is about connection, and being unable to get through is the standard complaint about any call centre. There are two more: getting through work means completing it, and getting through to somebody means finally making them understand.
1phraseget throughTo survive or endure a difficult period.
“She will get through this the way she gets through everything.”
2phrasesucceedTo succeed in contacting somebody.
“I could not get through to the surgery all morning.”