i lost my network please help - Sprint Samsung Galaxy S 4 Q&A, Help & Troubleshoot

hi
first i live in algeria an i have galaxy sph-720t they did work perfectly
with my cariar in algeria
untel i lose my lte
itried to change csc with samsung phone info
my phone reboot and told me invalid sim card i tried to flash it with stock frimware but same issus
invalid sim card please help

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