Sim Center: USSD & Travel SIM
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About this app
Sim Center is the only USSD companion you need β whether you're landing
in a new country, switching between SIMs, or just tired of Googling your
carrier codes every time.
π‘ USSD CODES FOR EVERY COUNTRY
Browse the complete USSD catalogue for any country β 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.
βοΈ 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.
π 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.
π± DUAL SIM & MULTI-SIM PROFILES
Carry two SIMs? Create separate SIM Profiles β 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.
π§ 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 β just like built-in codes.
π¨ EMERGENCY NUMBERS β ALWAYS AVAILABLE
Every country's emergency numbers are cached offline the moment you select
a country. Police, ambulance, fire, coastguard β always one tap away, even
with no internet connection.
π PRIVACY FIRST β NO CALL_PHONE PERMISSION
Sim Center never dials on your behalf. Every USSD code opens your phone's
built-in dialler β you stay in full control of every call. Only standard
internet permission is used (no location, no contacts, no microphone).
β‘ 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 β all as a guest.
Create an account to unlock SIM Profiles, custom codes, and cross-device sync.
KEY FEATURES
β USSD codes for 100+ countries
β Grouped by type β Balance, Data, Calls, Roaming, Top-Up, Promo & more
β Carrier filtering in the Discover tab
β Drag-to-reorder your personal code list
β Parameterised codes with live preview
β Offline-ready β Home, Manage & Emergency work without internet
β Clean, minimal design β no clutter, just the codes you need
β Supports Android 8.0 and above
in a new country, switching between SIMs, or just tired of Googling your
carrier codes every time.
π‘ USSD CODES FOR EVERY COUNTRY
Browse the complete USSD catalogue for any country β 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.
βοΈ 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.
π 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.
π± DUAL SIM & MULTI-SIM PROFILES
Carry two SIMs? Create separate SIM Profiles β 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.
π§ 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 β just like built-in codes.
π¨ EMERGENCY NUMBERS β ALWAYS AVAILABLE
Every country's emergency numbers are cached offline the moment you select
a country. Police, ambulance, fire, coastguard β always one tap away, even
with no internet connection.
π PRIVACY FIRST β NO CALL_PHONE PERMISSION
Sim Center never dials on your behalf. Every USSD code opens your phone's
built-in dialler β you stay in full control of every call. Only standard
internet permission is used (no location, no contacts, no microphone).
β‘ 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 β all as a guest.
Create an account to unlock SIM Profiles, custom codes, and cross-device sync.
KEY FEATURES
β USSD codes for 100+ countries
β Grouped by type β Balance, Data, Calls, Roaming, Top-Up, Promo & more
β Carrier filtering in the Discover tab
β Drag-to-reorder your personal code list
β Parameterised codes with live preview
β Offline-ready β Home, Manage & Emergency work without internet
β Clean, minimal design β no clutter, just the codes you need
β Supports Android 8.0 and above
Updated on
Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
Personal info, App info and performance, and Device or other IDs
Data is encrypted in transit
You can request that data be deleted
Whatβs new
π Welcome to Sim Center 2.0 β completely rebuilt!
β¨ What's new:
β’ π± SIM Profiles for dual SIM users
β’ π§ Custom USSD codes with fill-in fields
β’ π Discover tab β full country catalogue
β’ π¨ Emergency numbers, always offline
β’ βοΈ Drag-to-reorder your code list
β’ β‘ Works offline β your codes, always there
β¨ What's new:
β’ π± SIM Profiles for dual SIM users
β’ π§ Custom USSD codes with fill-in fields
β’ π Discover tab β full country catalogue
β’ π¨ Emergency numbers, always offline
β’ βοΈ Drag-to-reorder your code list
β’ β‘ Works offline β your codes, always there
Everyone
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About the developer
Adhikari Mudiyanselage Janaka Chathuranga Dissanayaka
apps@fironix.com
Pradeshiya Sabha Road
Thirappane
Anuradhapura 50072
Sri Lanka
