ios - canOpenURL succeed but openURL fails, for tel as urlschema -


my app this:

user enters phone number in 1 textfield. app saves it. displays phone number in detail screen has "call" button. call canopenurl method , if succeeds, keep call button enabled, otherwise keep disabled.

i creating url format : tel:phone number.

now, 1 of tester added phone number = '55'. now, when calling canopenurl, getting success, when call openurl method, not showing popup phone number.

this 1 working fine other phone numbers, 2 digit phone numbers = 13, specific phone numbers 55,56 getting failed.

note: per client's requirement, dont have put validation on phone number, must have n number of characters or so. so, please dont provide answers this. required reason why canopenurl getting success , openurl getting failed.

the function canopenurl check if schema valid, i.e. there app installed handle url. not resource valid, in case, numberis valid. see https://developer.apple.com/documentation/uikit/uiapplication/1622952-canopenurl

the problem 55 being invalid - see - caused specification of tel urlscheme in rfc 2806. copied relevant parts:

telephone-url         = telephone-scheme ":"                         telephone-subscriber telephone-scheme      = "tel" telephone-subscriber  = global-phone-number / local-phone-number global-phone-number   = "+" base-phone-number [isdn-subaddress]                         [post-dial] *(area-specifier /                         service-provider / future-extension) base-phone-number     = 1*phonedigit local-phone-number    = 1*(phonedigit / dtmf-digit /                         pause-character) [isdn-subaddress]                         [post-dial] area-specifier                         *(area-specifier / service-provider /                         future-extension) ... area-specifier        = ";" phone-context-tag "=" phone-context-ident

as read ebfn, telephone-subscriper starts either + or 1 character.

further on, in 2.5.2 phone numbers , scope, rfc says:

if <local-phone-number> used, <area-specifier> must included well.

in opinion, reason why tel:55 fails, tel:13 ok.


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