The communication app category is crowded with rivals including skype , whatsapp , and a slew of other messaging services .
这款通信应用拥有众多竞争对手，如skype、whatsapp和其他一系列通信服务。
Bbm is free on blackberry devices , even for " pay and go " users with no monthly contract , while other smartphone apps such as beluga and whatsapp use minimal amounts of data , and charge a small one-off fee .
Whatsapp is so popular in the netherlands that kpn , the largest dutch telecoms operator , blamed it for an 8 per cent decline in sms volumes in its first quarter .
' It surprised me , but it 's a good sign for tencent getting abroad , because in particular wechat is a combination of whatsapp and instagram , so it 's a unique value proposition that is probably pretty good for emerging market consumers , ' he said .
