Ngokuvamile kukhona amakhasimende angakwazi ukusebenzisa ngempumelelo izikena zawo ngenxa yokuthi awakwazi ukuthola inombolo ye-S/N noma ikhodi yelayisensi.
Amathiphu akulolu shicilelo azokufundisa ukuthi ungasivula kanjani isithwebuli sakho sisebenze ngokushesha. Chofoza ezithombeni ukuze ufunde kabanzi.