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I have a GSM module (M66 from Quectel) and a single cell Lithium battery,Based on Datasheet module operated in the 3.3 ~ 4.6 V and as I know battery deliver 3.7 ~ 4.2 V based on it's sate of charge.Then is this possible to fed the module directly from battery, without using any other chip (like MIC29302 which was recommended by Quectel)?

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You need over-discharge protection, to prevent damage to the battery under low power or fault conditions.

Typically it is safe to discharge Li-ion cells to at least 3.3V, but you should check for your specific chemistry.

But no, you should not need any kind of buck or boost converter.

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