Re: how to increase contact phone number font size for my microsoft lumia 532 phone?
Head over to phone Settings > ease of access > use the Text size slider to adjust the font size. Just tried this now with my L535 Dual SIM with the Windows Phone 8.1 Update 2 and the font size in the People Hub changed (not sure if this works for earlier OS versions).
Let us know if it works, and welcome to Windows Central.