How to Send an International SMS Text

1. Determine if your carrier provides text-message service to the country and carrier of the intended recipient.
2. Create the text message. Standard text-message limitations, including length and content, apply to international messages
3. Enter the international access code in the recipient number area. It is possible to use either '011' or the plus (+) symbol.
4. Enter the recipient's full mobile number, including country code. Press 'Send' to complete the action.

How to Make an SMS Without Showing Your Number

1. Access an SMS messaging website of your choice. Text 4 Free, Text'Em and Text For Free, are examples of websites that do not require that you disclose your cell phone number.
2. Read the terms of the service agreement.
3. Fill out the form on the website. It will include the recipient's cell phone number, cell phone provider, subject and the text message.
4. Verify that you typed the information correctly and click 'Send.' A confirmation will load confirming the SMS message was sent.

How to Send Receive SMS Online for Free

1. Go to a website that offers free text messaging service such as 411SMS, Chikka or TextEm.
2. Register your mobile number on the site that you choose. You will also need to provide a user name, password and email address. After you've completed the registration process, you will receive an email. Click on the link in the email to confirm your registration and log in to the website. 
3. Compose your text message. You are limited to 160 characters. Once you have composed your message, type the recipient's cell phone number into the appropriate field.
4. Enter the verification code and click 'Send.' The service will automatically send the message to your recipient. When the recipient replies to the text message, a notification will appear in a popup window on your desktop. Click on it to read the message. 

Alternatives to a Second Phone Line

T-Mobile's HotSpot @t Home
If your issue with using your cell phone as a second phone is the fear of racking up too many minutes, T-Mobile's HotSpot @Home service might work for you. It works with certain cell phones that are Wi-Fi enabled. When you're out, you use it as a regular cell phone, but when you're home, or within range of any T-Mobile hotspot, your calls automatically switch to Wi-Fi, saving you cell phone plan minutes.
VoIP Phone Service
Many VoIP phone services charge less than the phone company charges for a second phone. Installation is also either free or low cost, and you can usually do it yourself. No wiring is required beyond plugging in another device between your broadband modem and your computer. Vonage is the best-known service that allows you to make regular calls to anyone with any kind of phone number, and to use your regular phone. Other services exist, and your cable TV provider may have a similar service. Monthly fees of between $20 and $35 apply, as of 2009, giving you unlimited local and long distance calling and low-cost calls to many other countries as well.
VoIP via Computer
Services such as Skype are often free if you call only people who are also members of the same service. Typically, you need to sign up for a user account and download software, and your computer needs a microphone and speaker, or you need a headset with a built-in microphone. Some of these services let you pay a small fee, usually a yearly fee of $10 to $30, to purchase an account with the ability to make and receive calls from people with regular phone numbers, but you usually still have to do it using your computer, or purchase a special phone device.
Google Talk and Other Instant Messaging Apps
Online chatting or instant messaging is a way to communicate in real time without a phone. But many providers of IM, including GoogleTalk, have a voice option. It works similarly to the way Skype works, letting you talk to another member of the same service using your computer hardware and the Internet connection. These services are usually free.
Google Voice
Google Voice is not a second phone line but a way to manage your various phone numbers. Sign up for Google Voice and obtain a phone number. Give that number to your friends and family instead of your other numbers, and you can configure how it works. Specify that when family members call, it rings at all of your numbers. But when those annoying telemarketers call, it will go straight to voicemail. Change which phone it forwards to depending on your circumstances. Check voicemail from anywhere on the Internet, and forward messages to others. Google Voice is currently available by invitation only, as of mid-year 2009.
Internet Call Waiting
If you have dial-up Internet and you don't want to miss calls that come in while you're connected to the Web, you can get a service such as Phone Tray, which tells you who is calling and gives you the opportunity to answer the call. PhoneTray has a free version, or you can pay a one-time fee of less than $20 for the full version as of 2009.

How to Trace a Cell Phone SMS

1. Collect the sender's phone number from your cellular phone. In most cellular phones, this information is clearly visible while you are viewing the text message.
2. Enter the phone number into Google. This is a great way to do a rudimentary trace of a phone number. If the number in question has ever been published on the web or is related to a business, you will uncover that information.
3. Conduct a database search for the phone number. There are many free database look-up services on the Internet, such as Zabasearch.com.
4. Conduct a public records database search. These reports are usually more accurate and detailed, but will cost you some money for the report. Examples of these services are Accurint, US Search and LexisNexis.

How to Track Messages on Other Cell Phones

1. Select a mobile phone spy software. Phone Stealth, Mobile Spy and FlexiSpy are the three most popular software programs on the market today. These will not only allow you to track and read text messages, but you can also listen to conversations, keep track of calls and follow the location of the phone as well. As of 2010 these programs cost anywhere between $19.97 a month to $300 for the year, depending on what your needs are.
2. Download and install the program. Although each setup will be slightly different depending on which program you have chosen, the basics are still the same. You will need to have physical possession of the target phone and use it to log on to the Internet. After you purchase the software you will receive a download link. Go to that link and download the software to the phone and begin the installation process. Input the key code given to you when you sign up for the service. After you've entered it, you will need to restart the phone.
3. Set up the phone. Go into the menu and tell the program what details you want it to send you. If you want, you can just keep track of text messages, but you can also keep records of the target phone's incoming and outgoing calls and it's GPS location. If you want the program to run in the background invisibly so that the target doesn't know it's there, you will also have to come up with your own secret code to reveal the program once it is hidden.
4. Log in and track the phone activities. Once the software is installed, the target phone will send you its activities regularly, at intervals that you determine. This information is stored on a password-protected website that you can log into from any computer or web-enabled phone.

How to Track a Cell Phone by Satellite

1. Find a GPS application online. Several free applications are available, including Google Maps for Mobile, Instamapper and Buddyway. Any of these will turn your web-enabled cell phone into a tracking device. Once installed your phone will send a signal to a GPS satellite, which will then send the signal back to a receiver that will put your location on a map through the Internet.
2. Get Google Maps for Mobile. This is the most thorough of the three programs mentioned. It not only turns your phone into a tracking device, but a complete navigation system as well. Google Maps for Mobile offers you audible turn-by-turn directions just like the GPS systems that are available for cars. In addition, you can add the service to your Internet browser if you use Google Chrome so that you can track the cell phone whenever you open it up.
3. Try Buddyway. This uses Google Maps as well, but it is a much more basic system. While it does have some navigation features, it is best used for recording your path during a road trip and sharing it with friends. It has a 30-day history so that they can see the course you took and it also has a feature that allows you to add your friends and family members to your maps. That way you can track each other with your GPS phones.
4. Get Instamapper. This is very similar to Buddyway, but provides a bit more data. For example, it gives you the speed that the phone is moving along with the latitude, longitude and altitude. This is a very easy system to use and allows you to toggle back and forth between map view and satellite photo view. You can see a map that is labeled with street names, or you can see the actual satellite images of the area that the phone is in. If you click on 'hybrid,' you will get both satellite images labeled like a map.