I'm trying to find a way of retaining the first 0 of phone numbers when exporting a contacts list from Zoho CRM into Excel. 

Excel automatically strips the 0 from them because it's at the start of the number, although it is possible to use Format Cells > Custom > 00000000000 in Excel to make UK mobile numbers and landlines appear properly and ready for importing back into Zoho. However, this doesn't work for overseas numbers longer or shorter than 11 numbers.

Can anyone suggest a catch-all solution to force Excel to accurately reflect exactly what's exported from Zoho?

Thanks