Is there a signal from Xiamen Tianyi mobile phone to Singapore and Malaysia? Is it necessary to charge for international roaming?

When Xiamen Tianyi mobile phone roams to Singapore and Malaysia, it needs to replace a SIM card that can roam internationally in the telecom business hall. Card replacement is free, but your mobile phone account needs to be recharged to the balance above RMB in 500 yuan. The specific charging standard is new, the horse is different, the outgoing and incoming charges are different, and the QQ traffic is certainly different. Ask such a complicated question without giving points. Who is willing to give you a definite answer? Forget it, I'll tell you the truth. When changing the card, the business hall will give you a detailed manual of national charging standards.