You can use Gmail from anywhere anytime. If Gmail stops to work, then, first of all, confirm the internet connection is strong enough, and you are using correct server settings of Gmail, and also confirm your email address and password is correct. Or, try to update it if there is any pending update. If you still get the same, then speak to a live person at Google to resolve it as soon as possible. https://customer-servicephone-number.com/gmail-customer-support-number/