Nokia 301 Service Manual page 61

RM-839; RM-840; RM-841
BB Troubleshooting and Manual Tuning Guide
SIM card rejected
The error "SIM card rejected" means that the ATR message received from SIM card is corrupted, e.g. data
signal levels are wrong. The first data is always ATR and it is sent from card to phone. For reference a picture
with normal SIM power-up is shown below. The signals are measured by the SIM card connector.
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