Paid-For Location Based Services
If the person you need to track isn't signed up to Google, then there are Location Based Services (LBS), that have agreements with most of the network providers, to receive data from a mobile phone. These are offered either via a website or through a call-center. They aren't always hugely accurate, and there is a cost involved, but they can tell you the last known location of the mobile phone as a minimum - obviously services differ according to the company, the phone, and the price you are willing to pay.
Sprint Workforce Locator is aimed at businesses, and you can set up an account to have many people followed, and add extra accounts so other staff members in the office can know where their workforce is - extremely good for businesses that have delivery drivers. Can be used with all new Sprint phones, as well as some older models, is very accurate, and offers many added benefits too. Click here for more information.
Mobile Locate and Child Locate, are operated by the same company in the UK, and offer a monthly subscription, or pay-per-location option, which is very cheap. However, results aren't that accurate - depending on the location it can be accurate from 150m-9km. The Child Locate option is a little more expensive, but includes extra features such as the 'Find Me' feature, where the child can text to a preset number if they get lost. Find more information.
Trace a Mobile, is a pretty expensive option, although if you regularly want to locate someone by mobile phone, then you may find it more cost effective than using Mobile Locate. This would be especially good if you are a business keeping tabs on a number of employees. The advantage of this service is that it can locate any phone, it doesn't have to be a new phone with GPS, as the technology they use doesn't use this method. This does mean that results are only accurate to within 50 meters though. Find more information.
Now we've answered the question, "Can I locate someone by mobile phone?", we can take a look at how to locate your phone if it is lost or stolen. The methods on the next page are also useful in locating someone by mobile phone too.