Not really. Nowadays, it is generally considered unsafe to share personal information such as phone numbers with resume writing services. Instead of your phone number, you should share your email id, so that if there is any doubt with the resume they can clarify it through email.

Yes, there are many resume writing courses available for you to take online. Once you become good at it, you can also provide resume writing services to other people who need it.

As well as paid work, you can put the following on your resume: 1) Relevant work placements or work experience. 2)  Written testimonials that prove your capabilities and skills. 3) Hobbies or interests relevant to the job or industry.