=IF(AND(LEFT(RIGHT(A1,7),1)<"-",ISNUMBER(--RIGHT(A1,7))),"OK","Problem")

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HTH

Bob


(there's no email, no snail mail, but somewhere should be gmail in my addy)



"Omar" wrote in message
...
Dear Experts,
I have one column with 4424 rows represents customer's phone numbers
as follow.
971-4-5735403
How can I know if the last part (5735403) contains seven digits only?
Many thanks in advance
Omar