[Admin Tool Feature]: Phone value as string instead of number

[ssandino]

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Proposition by @mkue in a merged PR #706 :

I think we should switch to using a string to store a phone number using the + prefix. The validity of the phone number could then easily be checked with a regex.

@MDikkii @novas1r1, can you assess the impact of such a change on the mobile app? Are there any best practices in mobile development that should be considered?

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