UK major telecom companies customer service numbers and opening hours

1. BT: www.bt.com/products/mobile

• Customer Service Number: 150 (from BT phone) or 0330 1234 150 (From any other phone) From abroad +0044 150 174 7714
• Opening Hours: Monday to Friday - 8:00am to 9:00pm, Saturday - 8:00am to 8:00pm, Sunday - 9:00am to 6:00pm

1. Virgin Mobile: https://www.virginmedia.com/mobile

• Customer Service Number: 789 (from Virgin phone) or 0345 600 0789 (From any other phone) 
• Opening Hours: Monday to Friday - 8:00am to 9:00pm, Saturday - 8:00am to 8:00pm, Sunday - 8:00am to 6:00pm

1. Sky: https://www.sky.com/shop/mobile

• Customer Service Number: 0333 7591 018
• Opening Hours: Monday to Sunday - 8:30am to 9:00pm

1. TalkTalk: https://talkmobile.co.uk/

• Customer Service Number: 588 (from TalkTalk phone) or 0333 304 8064 0r From abroad +0044 333 304 8064
• Opening Hours: Monday to Sunday - 8:00am to 8:00pm

1. EE: www.ee.co.uk

• Customer Service Number: 150 (from EE phone) or 0800 079 8586 (From any other phone) 
• Opening Hours: Monday to Friday - 8:00am to 9:00pm, Saturday - 8:00am to 8:00pm, Sunday - 8:00am to 6:00pm

1. O2: www.o2.co.uk

• Pay As You Go Customer Service Number: 4445 (from O2 phone) or  0344 8090222 (From any other phone) or From abroad +0044 7860 980202
• Pay Monthly Customer Service Number: 202 (from O2 phone) or  0344 8090202 (From any other phone) or From abroad +0044 7860 980202
• Opening Hours: Monday to Friday - 8:00am to 9:00pm, Saturday - 8:00am to 8:00pm, Sunday - 8:00am to 6:00pm

1. Vodafone: www.vodafone.co.uk

• Customer Service Number: 191 (from Vodafone phone) 0333 304 0191 (From any other phone) 
• Opening Hours: Monday to Sunday - 8:00am to 9:00pm

1. Three: www.three.co.uk

• Customer Service Number: 333 (from Three phone) or 0333 338 1001 (From any other phone) or From abroad +0044 7782 333 333
• Opening Hours: Monday to Sunday - 8:00am to 8:00pm

1. Lyca mobile: www.lycamobile.co.uk

• Customer Service Number: 322 (from Lyca mobile phone) or 0207 132 0322 (From any other phone) or From abroad +0044 207 132 0322
• Opening Hours: Monday to Sunday - 8:00am to 8:00pm

1. Lebara mobile: https://mobile.lebara.com/gb/en/

• Customer Service Number: 5588 (from Lebara phone) or 0207 031 0791 (From any other phone) or From abroad +0044  207 031 0791
• Opening Hours: Monday to Sunday - 8:00am to 8:00pm

Please note that these numbers and opening hours are subject to change, so it's always a good idea to check the company's website or call the number provided for the most up-to-date information