a SIM Card in Indonesia is widely known as a "SIM Card" as well, or a "Number". So you can just use the term "SIM Card" to provider seller. (Since its an acronym, remember to say SIM, pronounced like "Seem", do not spell it S-I-M.). Cell Phone charge in Indonesia is called "Pulsa". This is a credit balance for you SIM Card, and the quantity is calculated in Indonesian Rupiah (IDR). To buy a SIM Card: in English: "I want to buy a new number for my cellphone" or "I want to but a SIM Card" In Indonesian: "Saya mau membeli nomer baru untuk telepon genggam saya" or "Saya mau membeli SIM Card" To buy a Cell Phone Credit Balance: in English: "I want to refill my Cell Phone's Credit Balance" (but I'm not sure for this one) in Indonesian: "Saya mau isi Pulsa" or simply say "Saya mau beli pulsa"

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I'll try to answer but I couldn't understand the question, do you mean how to ask a seller if you want to buy sim card and phone credits in Indonesia? Or do you mean to translate this sentence "When I go to Jakarta, I have to buy the SIM Card and Cell Phone Charge everytim" into Indonesian?

The name of the Indonesian capital is spelled Jakarta in English. As you probably know, a SIM card is a removable card which contains a memory chip. MB is an acronym for megabyte. If you mean you have to buy a SIM card and pay a megabyte charge each time you go to Jakarta, you could say, "When I go to Jakarta, I have to buy a SIM card and pay a megabyte charge."