telprompt: allows less characters than the phone itself. Which?

Question

I'm using the address book of the iPhone to call numbers using telprompt:. A number with spaces and dashes doesn't work, while one with plus and numbers only does work. The iphone itself doesn't allow typing them, but synchronising with the mac gets me lots of (invalid?) phone numbers. Which characters are allowed, and why?

score 3 · Answer 1 · answered Jan 16 '12 at 09:40

Try using this code, it leaves only numbers in the phone number string:

NSString* phone = @"477 (38) 232-35-47";
//@"477 (38) 232-35-47"
phone = [[phone componentsSeparatedByCharactersInSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]] componentsJoinedByString:@""];
//@"477382323547"
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"telprompt:%@", phone]]];

score 1 · Answer 2 · edited Oct 07 '21 at 06:11

1

See section 3, "URI Syntax", of RFC 3966: The tel URI for Telephone Numbers.

edited Oct 07 '21 at 06:11

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answered May 30 '11 at 14:51

Jeremy W. Sherman

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so spaces are not allowed, but dashes are. – Stephan Eggermont May 31 '11 at 08:46

telprompt: allows less characters than the phone itself. Which?

2 Answers2