Gravityforms customization: merge two text fields into a hidden one

I have a GravityForms form where I collect some personal data, including phone numbers, which are split in two text fields (internationa area code and phone number). I need to merge those two fields into a single one (a hidden text field) and I think the best option is using the gform_pre_submission feature (check for it on GF documentation).

So the situation is like this:

Field A (area code): +39

Field B (telephone): 3331234567

Field C (hidden): +393331234567

I need the hidden field to populate a mailing list DB that has only one column for the phone number.

Skills: PHP, WordPress

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