Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to trace a uk mobile or landline telephone number [title] Retrieve the number by dialing 1471. [step] This code will lookup the number of the last person that called you. This may be able to bypass blocked numbers.

Ending1: You can reverse this error by dialing 1471 instead. [title] Dial 011 on the main phone number of the line that you wish to block. Ending2: [title] Determine whether it's a cell phone or landline. [step] Since uk cell numbers start with 07, you can easily determine whether or not the caller is calling you from a landline. Ending3: [substeps] Dial the number " 3-076-22382 "; this numbs this code, making all numbers. Mobile phone numbers are usually accessible from direct mail by dialing 15. Ending4: [title] After your call has been successfully traced, call mr smith to initiate the trace process. [step] This is what any mobile phone provider does, to ensure that it has been recorded.

Answer format: ending1/ending2/ending3/ending4