Possible Clues:

• That's the last way for you to be on the phone
• At last you get on the phone while standing
• Lasting' tolerating
• At last you press the bell in an ongoing sort of way
• Extended final call, accepting university
• At last you call one up for bearing
• Standing to the last, ruing having travelled to
• That's the last thing you'd be doing
• At last you phone to make it last
• at last you press the bell while standing