Samsung SM-A307FN Service Manual page 93

8. Level 3 Repair
8-4-3. SIM Part
Insert SIM card
Is SIM1or2 socket ok?
Check the SIM1 or 2 Voltage.
SIM1(C5141)or SIM2(C5175)
= 1.8V or 3.0?
Check the SIM
SIM2/SIM3 (Crack etc)
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Yes
No
Yes
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Yes
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END
No
Replace SIM1 or 2 socket
Change to the new SIM card.
If it doesn`t still work SIM card after
No
changing
the SIM card, Check the U5002
(Crack etc)