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Cornerstone telecoms
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Check airtime balance MTN Awuf>> *559*14# MTN >> *310# GLO >> *310# GLO 5x >> #555*5# AirTel >> *310# Etisalat >> *310#
Check data balance MTN (SME) >> *323*3# MTN (Corporate) >> *323*2*4# MTN >> *323# GLO >> *323# AirTel >> *323# Etisalat >> *323#