Hi sorry slow reply. On the positive side it shows your willingness to work with them. There are battles and they are wars; I prefer to win the war.

Learn from yesterday, live for today, hope is for tomorrow else what is left if you remove a mans hope.

Mobile phone number, email addresses and car registration are ALL optional because otherwise it would infringe the Human Rights provisions
and in most cases are irrelevant to the offence/s.
They'll try to fill in all the blanks on their form and ask you, and then give you a copy which will show "Not obligatory" or Optional (too late).
Know your rights folks and don't give them anything they don't need for their mass intelligence gathering.

I was always clear about my phone number. It makes it easier for them to contact me if they need to speak to me and to recognise text messages as being from me. They can't check your phone account without a warrant anyway, so they'd probably appreciate your honesty, even if they won't tell you that.

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If you are to punish a man retributively you must injure him. If you are to reform him you must improve him. And men are not improved by injuries. (George Bernard Shaw)

Hi
You will also see that a "vehicle reg No." is optional, and it says you are to made aware that it can / will be monitored.

Again in the overal picture is the possible issues of not supplying it worth it?

Learn from yesterday, live for today, hope is for tomorrow else what is left if you remove a mans hope.

The SHPO usually makes reference to you providing them with the details of the phone, such as the IMEI, but not the number. I think thats because the IMEI can't be changed, while your number can.

The best thing to do when it comes down to personal information is to provide it anyway if there has been a change, which must be done with in 3 days of that change happening. SHPO's do not usually include things enforcing you to provide personal details because then that would conflict with what the register is for. I do find it strange they would say phone numbers or not required though.

On the form at police station when updating any details of bank cards etc it says phone number not required. Why I have seen on the forum people mentioning you must supply any contact numbers to ppu? Is it the shpo conditions for contact offences to notify of contact numbers they referring to?