For few days I couldn't download from play store and my gmail app and other Google apps were not connecting to network. Now I can't even sign in into play store. I need to use an app urgently. What can I do?

I'm having the same issues. Do you also use an airtel line?

Sign out of your google account and sign in again.

SirLewis:
I'm having the same issues. Do you also use an airtel line?

no

follow this link op
https://techredirect./2016/10/17/how-to-clear-playstore-error-codes/?_e_pi_=7%2CPAGE_ID10%2C2162848608

Here is the perfect fix

http://www.highteknology.com/2016/03/my-google-play-store-is-showing-no.html

Op to solve your problem kindly answer these questions :
1. What network do you use?
2. Did you change network recently?
3. Do you use a dual Sim phone?
4. If yes which Port, is it Sim 1 or sim2 that provides Internet.
Reason for this question is this . I have the same issue and I solved it my own way.

Op to solve your problem kindly answer these questions :
1. What network do you use?
2. Did you change network recently?
3. Do you use a dual Sim phone?
4. If yes which Port, is it Sim 1 or sim2 that provides Internet.
Reason for this question is this . I have the same issue and I solved it my own way.

peterjero:
Op to solve your problem kindly answer these questions :
1. What network do you use?
2. Did you change network recently?
3. Do you use a dual Sim phone?
4. If yes which Port, is it Sim 1 or sim2 that provides Internet.
Reason for this question is this . I have the same issue and I solved it my own way.

I use Mtn, I don't cahnge network. In use dual sim but both Mtn.