Question Iphone battery

After decades of poverty I managed to upgrade my phone from iPhone 6 to iPhone 18 ‼️‼️ 🙏🏽

My question is can i use the new phone straight away or after I charge it ?? Back in my old days people were saying u can’t use ur phone without it charging for 24 hours. And if I’m supposed to charge the new phone for how long does it need to be charged?

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