Yes, but with some caution. Buenos Aires is generally safe for tourists, but petty theft like pickpocketing or snatching phones can happen, especially in crowded areas.
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Avoid flashing expensive phones in busy streets, markets, and public transport. 
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Keep your phone in a front pocket, crossbody bag, or zipped backpack. 
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Be extra cautious in La Boca, Once, Constitución stations, and during crowded events or demonstrations. 
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Using your phone discreetly for maps, photos, or calls is fine; just stay aware of your surroundings. 
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In cafés, restaurants, and taxis, it’s usually safe, but don’t leave your phone unattended.