A signal of -98 dBm isn't the best signal strength, but it isn't terrible either. The cellular signal strength is displayed in negative numbers so a signal of -86 dBm is better than -98 dBm and -98 dBm is better than -105 dBm. A signal around -105 dBm is a weak signal. The phone will register no signal is available at -120 dBm.
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