Issue Description
SIM Toolkit app fails to open or functions incorrectly.
Common Causes
SIM card error
Carrier service issues
App cache corruption
Step-by-Step Solution
Step 1: Restart Phone
Refreshes SIM services
Step 2: Reseat SIM Card
Power OFF → remove SIM → reinsert
Step 3: Clear SIM Toolkit Cache
Settings → Apps → SIM Toolkit → Storage
Clear cache
Step 4: Contact Carrier
SIM Toolkit depends on carrier services
Explore Further
Replace SIM if issues persist
Prevention & Best Practices
Keep carrier settings updated.