Generally a brief note or a phone call will suffice.

通常写个便条或打个电话就足够了。

《牛津词典》

A thank-you note or telephone call after the visit is also considered polite and is an appropriate way to express your appreciation for the invitation.

拜访后的一封感谢信或一个电话也被视作一种礼貌，是一种表达你对收到邀请的感谢的适当方式。

youdao

Note the client doesn't call the logging methods.

注意，客户机没有调用日志方法。

youdao

For example, when a user pulls out the S Pen during a phone call, the S Note application automatically pops up on the screen, allowing users to jot down a quick note.

ENGADGET: Samsung Galaxy Note II unveiled: 5.5-inch HD Super AMOLED display, Android Jelly Bean and more S Pen functionality

No note or telephone call, nada.

NEWYORKER: The Pura Principle

To be sure, rival IBM sounded an upbeat note during its earnings call last month.

FORBES: Magazine Article