Is it "Call me at anytime" OR "Call me anytime"

In colloquial, we normally use "Call me anytime." But, I think gramatically "at anytime" is right. Am I right?
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I don't think they have quite the same meaning.

Call me anytime is a casual invitation to call the person and it just means I'd be happy to talk to you.

Call me at any time means that you are saying you would welcome their call at any time of day or night - even 3am! This would be used more to emphasise that you are always available to them...for example if you were leaving your baby overnight with a babysitter you might say 'Call me at any time if there is a problem, won't you' meaning don't wait till morning before letting me know my kid is sick, hurt, whatever...
AT is used for a specific time/time frame and not intended to be divisible: at midnight. Not 11:59, not 12:01, but only 12:00

IN is used for time which is intended to be divisible: in the afternoon , in 5 hours, in March.

So, to use "at anytime" should be looked at in context. If you are going to call, you aren't going to hang up AT a certain time (meaning as soon as you call). That time you are talking or even waiting for the other person to answer is divisible. So, I would not use AT in this case.

Perhaps, a better use would be with the word "check". You can check your email at anytime. True, if you have email, you'll probably spend time replying which could be seen as divisible. If you don't though, then we are simply referring to the time as a whole (like at the end of the month). We aren't dividing that time up.
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WwwdotcomYou can check your email at anytime.
I'd write it : "any time"...

At http://www.grcc.edu/eslresources they use "anytime" when it follows a verb, and they use "any time" after a noun. Don't know if this is the rule or not. In dictionaries, "anytime" is found but "any time" isn't.


I would have tought the preposition "at" requires a noun, hence "at any time"? "Anytime" is an adverb.

"Call me anytime you want", but "call me at any time"
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I understand "anytime" is a word proper to AmE. In OED, there is no entry for "anytime". OED contains 466 quotes using "any time" but only 9 quotes using "anytime". I believe the most formal expression in BrE is "Call me at any time". But "Call me any time" is also possible. In English, time adverbial noun phrases are often spoken without prepositions. This preposition-less adverbial noun phrase is called "adverbial accusative or objective" by some linguists, and it is a heritage of the old Anglo Saxon grammar. Because of its strangeness as a collocation in modern English, I believe, Webster changed the preposition-less adverbial "any time" to "anytime" and entered it as an adverb in his dictionary.

Paco, are you still the same? (I'm just talking about your avatar...)
Hello Anne

The same as what? Do you mean I should take off the red clothes?

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