The PayPal phone number is 1-888-221-1161 for account holders and guests in the US, 020-8080-6500 for the UK customers (may be charged at a national call rate), 0800-365-9448 for landline calls, and 1-402-935-2050 for guests and account holders outside the US.
The PayPal customer support is available via phone from Monday to Sunday between 6 AM and 6 PM PT.