WhatsApp Messenger – a universal communication app, is one of the most popular messaging apps offered for mobile device, with over 10 percent of human beings actively using it every month. Given this volume of use, it’s clear it gets a lot of things right, but today we will be concentrating on what it gets wrong.
And this acrticle will show you five most common WhatsApp problems and their solutions.

1. Download WhatsApp on your Android phone or devices
You can directly download the WhatsApp program from its website. Once the file’s downloaded, open it to install the latest WhatsApp APK. And please note that you need to have a smartphone running Android version 2.1 (by the end of 2016, Android 2.1 and 2.2 will no longer be supported) or higher. You can check your phone’s current Android version in Settings > About Phone.
If you’re trying to install the WhatsApp app from the WhatsApp website, you’ll need to have Unknown Sources enabled in your security settings. Go to Settings > Security > Unknown Sources to activate it.

2. WhatsApp doesn’t recognize my contacts
There can be many reesons why WhatsApp wouldn’t recognize your contacts, so here is a simple checklist for you:

3. What to do when I can’t connect to WhatsApp
If you can’t connect to WhatsApp, this is usually because you don’t have an active internet connection. Check whether you can use any other online services or browse any web pages on your phone. If you aren’t able to send a message, here are a few solutions:
Note: Sometimes, even the mighty WhatsApp experiences server issues. If you think WhatsApp isn’t working because the service is down, then head over to the WhatsApp Status Twitter account, where outage updates are provided.

4. I can’t see ‘Last Seen’ on WhatsApp
If you are unable to see the Last Seen timestamp in a conversation, it could be for a number of reasons. If you’ve disabled your Last Seen time in Settings > Account > Privacy > Last Seen, then you won’t be able to see other people’s Last Seen times, either.
If the problem is only with one or some contacts, then it might mean that they’ve disabled the Last Seen time in their WhatsApp settings. If they’re still receiving and responding to your messages, this is almost certainly the case.
The final reason is that a contact has blocked you. If your messages never get past the one gray tick, then this makes it more certain that you’ve been blocked, and if you can’t see changes to the contact’s profile, then you’ve certainly been blocked. Many apologies.

5. How to protect my Whatsapp account if my phone is lost or stolen?
First, lock your SIM card by contacting your carrier. This should always be your first step. Once this is done, WhatsApp can no longer be activated on that device. Once you have a new SIM (presumably with the same number) you can reactivate WhatsApp on your new phone.
In the meantime, send WhatsApp a message asking them to deactivate your account. Send an email with the subject “Lost/Stolen: Please deactivate my account” to support@whatsapp.com, and include your phone number (complete with an international dialing code) in the email body. If you don’t do this, WhatsApp can still be used over Wi-Fi.

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