20 Most Recent HTC One M8 32 GB Grey Smartphone - AT&T 2 GB RAM, 32 GB Internal Storage, Android, 4G, 5 MP Camera - Page 7 Questions & Answers

first, you have to check your preference setting i that 3g or 2g if you have 3g then select 3g and then try to connect with 3g

Use AppMonster application if your phone is rooted.

Try the website for answers. How do download WhatsApp on my HTC Window 8 0 phone VisiHow

Try removing the sim and cleaning the contacts. Be very careful doing this as you can damage the contacts.

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Via hardware buttons on phone. Power off phone. Press and hold Vol down, press power button until you see bootloader (3 happy androids on skateboards at bottom of page). Release vol down. Select Factory reset, and just go with it.

you can go to setting and then call setting then you can see unblock option you have to inter and unblock your number which one you like https://www.youtube.com/watch?v=h-G8b9-etdk

you have to go to call setting and scroll down and you can see the block number you have enter and unblock your number which number you like to unblock

Back up your information to Google drive via a wireless connection or wifi and then restore the phone to factory default. Once the phone is reset then pull the information back from google drive. After the back up make sure to delete the Google account off the phone before reset or Google 2 step verification could lock you out.

you have to settings and then go to tethering and mobile hotspot and then click on mobile hotspot on activate your data sharing