the problem is that in Italy (and perhaps in Europe), the percentage of iPhones is similar to Android. This means that a universal messaging system is needed, and imessage is not it. Whatsapp (o Telegram) offers the possibility of sending voice messages which Italians use instead of voicemail. You do not answer? I'll send you a voicemail! then when you read it...you will answer.
the problem is that in Italy (and perhaps in Europe), the percentage of iPhones is similar to Android. This means that a universal messaging system is needed, and imessage is not it. Whatsapp (o Telegram) offers the possibility of sending voice messages which Italians use instead of voicemail. You do not answer? I'll send you a voicemail! then when you read it...you will answer.