Hey Product Hunt 👋 I'm Janaka, and I built Sim Center after getting genuinely frustrated every time I landed in a new country with a local SIM and had absolutely no idea what codes to dial. You know the situation — you've just landed in Bangkok or Lagos or Colombo, you've bought a SIM at the airport kiosk, and now you need to check your balance or activate a data pack. You open Google, search "AIS Thailand USSD codes", get 12 contradictory results from 2017, and try codes until one works. That's the problem Sim Center solves. **What it does:** 🌍 **USSD codes for 40+ countries** — organised by carrier and category. Balance, data, top-up, roaming, customer care. Tap any code to open your dialler pre-filled and ready to go. ✈️ **Just Landed card** — the moment you select a new country, the 3–5 most essential codes appear at the top. No scrolling, no searching. Just the codes a traveller needs in the first 5 minutes. 📷 **Scan your recharge card** — recharge voucher PINs are 12–16 digits long. Nobody wants to type that. Point your camera at the scratch card, Sim Center reads the number and fills it in. Uses on-device ML Kit — no server, no API call. 📱 **SIM Profiles for dual SIM users** — carry a home SIM and a travel SIM? Create named profiles for each. Switch between them with one tap. Each profile has its own code list and carrier. 🚨 **Emergency numbers always offline** — police, ambulance, fire for your selected country are always cached locally. No internet needed. The primary number is shown large and immediately visible. 🔒 **Zero call permissions** — we never request CALL_PHONE permission. We open your phone's dialler pre-filled. You tap call. That's the right way to build this. **Who it's for:** People who travel frequently and buy local SIMs. People with two SIMs who are tired of Googling codes. Sri Lankans and Indians and Nigerians and Kenyans who just want quick access to their carrier's codes without opening a browser. **What's next:** We're expanding carrier coverage, adding more countries to the "Just Landed" essentials data, and building a community contribution layer so locals can suggest codes we've missed. Would love your feedback — especially from people who travel a lot or use dual SIM phones. What would make this more useful for you? — Jana

Sim Center: USSD & Travel SIM

USSD codes for every country. Built for travellers.

USSD codes for every country. Built for travellers.