Almost everyone uses messenger services, although they have vulnerabilities. Foundation Warentest has now examined WhatsApp and Co.. WhatsApp, Telegram, Signal and Co.: That has studied Stiftung Warentest Foundation Warentest finds dangerous weaknesses at the messengers Foundation Warentest: Telegram as an exception, WhatsApp just over the "good" Dortmund - instead of SMS with 160 characters as a limitation or expensive MMS noise today's minutes of voice messages, Ellenlange texts, pictures or videos easily from mobile phone to mobile. Messenger services such as WhatsApp *, Threema or Telegram * are firmly anchored in everyday life. But: Which messenger service is actually recommended? That found Foundation Warentest. Heidelberg24 * summarizes: WhatsApp, Telegram, Signal and Co.: That has studied Stiftung Warentest As for other test reports * too, there are some criteria for Messenger services, putting special value on the Stiftung Warentest. Thus, functionality, ie...