Sim Center: USSD & Travel SIM

Sim Center is the only USSD companion you need — whether you're landing in a new country, switching between SIMs, or just tired of Googling your carrier codes every time. 📡 USSD CODES FOR EVERY COUNTRY Browse the complete USSD catalogue for any country — check your balance, activate data packs, find customer care numbers, call forwarding, roaming activation, and more. Switch countries in one tap from the top bar. ✈️ BUILT FOR TRAVELLERS Land anywhere, open Sim Center, and know your essential SIM codes in under 10 seconds. No more searching the internet or asking hotel staff. The "Just Arrived" card highlights the most important codes the moment you select your country. 📋 YOUR PERSONAL CODE LIST Add only the codes you actually use to your Home tab. Reorder them exactly how you like. Your list stays with you even when you're offline. 📱 DUAL SIM & MULTI-SIM PROFILES Carry two SIMs? Create separate SIM Profiles — one for your home SIM, one for your travel SIM. Each profile has its own independent code list. Switch between them with a single tap. 🔧 CUSTOM USSD CODES Create your own USSD codes for codes not listed in our database. Add fill-in parameters (amount, recipient number, PIN) and Sim Center will prompt you to fill them in before dialling — just like built-in codes. 🚨 EMERGENCY NUMBERS — ALWAYS AVAILABLE Every country's emergency numbers are cached offline the moment you select a country. Police, ambulance, fire, coastguard — always one tap away, even with no internet connection. 🔒 PRIVACY FIRST — NO CALL_PHONE PERMISSION Sim Center never dials on your behalf. Every USSD code opens your phone's built-in dialler — you stay in full control of every call. Only standard internet permission is used (no location, no contacts, no microphone). ⚡ USE WITHOUT AN ACCOUNT You don't need to sign up to use Sim Center. Browse Discover, add codes to your Home list, reorder them, and access emergency numbers — all as a guest. Create an account to unlock SIM Profiles, custom codes, and cross-device sync. KEY FEATURES ✔ USSD codes for 100+ countries ✔ Grouped by type — Balance, Data, Calls, Roaming, Top-Up, Promo & more ✔ Carrier filtering in the Discover tab ✔ Drag-to-reorder your personal code list ✔ Parameterised codes with live preview ✔ Offline-ready — Home, Manage & Emergency work without internet ✔ Clean, minimal design — no clutter, just the codes you need ✔ Supports Android 8.0 and above