Learn English – “To call” vs. “to ring”

• Please call me on this number. You can reach me on this number.

Acceptable everywhere, principally used in UK/Australia/New Zealand. Sounds strange to North American ears, but understood.

• Please call me at this number. You can reach me at 0088000900.

Acceptable everywhere, principally used in US/Canada. Might sound strange to English speakers outside North America, but widely understood.

• Please call me through this number. You can reach us through this number.

Usually used when the caller will need to speak to an intermediary before being connected to the desired party (such as when a receptionist answers all incoming calls). Not generally used when the number connects directly to the desired party (which is "DID" Direct Inward Dial in North America, and "DDI" Direct Dial-In elsewhere).

Presently has two meanings: currently and shortly. So, one difference is that shortly does not mean currently. Otherwise they mean pretty much the same thing.

Ngrams shows that shortly is more common than presently. If we take into account the fact that the results are context-agnostic and the fact that a fair portion of the uses of presently found by Ngrams was in the sense of currently, we can conclude that in the sense of soon the word shortly is far more common than presently.