How to Unlock a Samsung SGH

1. Turn off your Samsung SGH phone and put the SIM card, from the new mobile phone carrier, inside your Samsung SGH phone.
2. Turn on your Samsung SGH mobile phone. Check if the battery is full enough so you can perform the unlocking process. If needed, recharge your phone's battery before unlocking it.
3. Flip open, if needed, making the screen of your Samsung SGH phone visible.
4. Type *#9998*3323# or #*7337# if you have a newer Samsung SGH model. Since the SGH line includes many different models, check one of the many websites that provide free unlock codes for Samsung SGH phones. This way, you will be sure that the code you are typing in is the right kind of code for your mobile phone model. (Check the Resources section to see some of the websites with the Samsung unlock codes mentioned in this step.)
5. Wait until the phone reboots, which usually takes anywhere from a few moments to one minute.
6. Type *0141 and then press the Call button.
7. Turn off you Samsung SGH phone and then put the new SIM card inside again.
8. Turn the phone on again, this time typing 00000000 once the phone is ready. When you see the message, 'Network lock deactivated,' that means that your Samsung SGH mobile phone is unlocked and ready to use.

How to Send and Receive SMS Data on a PC

1. Use a site that offers free SMS service. Some examples are Chikka,  TextEm, and 411SMS (see Resources). These services are free (as of September 2010) and will let you both send and receive messages from your computer.
2. Register for a free SMS service. You'll need to provide your mobile phone number, user name, password and email. You'll subsequently receive a confirmation email to verify the registration process.
3. Reply to the text message that you'll receive after registration. This usually includes your login details and some important information that you used for registration. To confirm subscription, reply with 'REGISTER' or 'CONFIRM' on the text message that you received.
4. Go to the site's homepage and login. Once you are in the dashboard, click on 'Send SMS' and wait for the text message editor to pop-up.
5. Compose a text message as you usually do. Once you are finished, enter and confirm the phone number of the recipient.
6. Click 'Send' to send the message. You will be notified of message replies and you can read them as long as you are logged into the SMS service.

How to Receive Stock Alerts From Yahoo Finance

How to Send Free Text Messages Abroad

1. Check your contact's mobile phone carrier for free text messaging online. Find out what carrier your friends and family abroad use. Search those carriers' websites for free SMS services. Typically, you can use an online form to type a message and send it to any subscriber number for that carrier. Enter the contact's phone number, including area code, and your message. Keep your messages short as there is a character limit.
2. Use Yahoo! Messenger (messenger.yahoo.com) or another instant-messaging program with free SMS service. In Yahoo! Messenger, sign into your account. Right-click one of your contacts and select 'Contact Details.' Enter your recipient's mobile phone number with country and area code plus the number. Save the changes. Right-click again and select 'Send SMS Message.' You can now type in your message and send it off just like an instant message when chatting. The procedure is similar for other software with SMS support.
3. Use an online service, such as Chikka (chikka.com), that lets you send free SMS text messages to your contact's country. Follow the prompts for registration and software download (if you want it). You may be asked to give your eail address instead of your mobile phone number, depending on your location. Once registered, you can sign into the Chikka website and send and receive texts. If you are offline, your messages will be delivered either to your phone or inbox.

How to Send a SMS to Korea

Using Skype
1. Download and install the Skype software by visiting Skype's website and clicking 'Get Skype' on the top of the page. You will find it in between 'Features' and 'Prices.'
2. Register for a Skype account. After installing the software, you will be asked to choose a Skype name and password.
3. Add phone numbers to your contact list. On the main Skype screen, click the 'New' tab on the upper-left corner and select 'New Contact.' A new window will open, and on the bottom, under 'More Things You Can Do.' Click 'Save a phone number in your Contacts list.' Enter the name of the person you wish to SMS and his mobile phone number.
4. Buy Skype credit. Return to the Skype home page, and click the 'Price' tab on the top. Then click 'Skype Credit,' which is located under 'Prices.' Now click 'Buy Skype Credit' and log in to your account if you are not already logged in. Have your credit card ready and select the amount of credit you would like to purchase.
5. Return to your Skype interface, and select the contact you wish to send an SMS to. Start typing out an SMS to this contact in the bottom-right corner. After you have typed out your message, click the 'Send SMS' icon on the right.
Using Microsoft's SMS Sender
6. Download and install SMS Sender from Microsoft's website. (See Resources.)
7. Run SMS Sender and you will see a small window that asks you to select your device, asks for the destination number and has a field for you to enter your text for the SMS.
8. Select your GSM phone connection in the 'Available Devices' box.
9. Enter the phone number that you wish to send SMS to, including the country code, preceded by a 'Plus' sign. For example, for a South Korean number, you would enter +82 before the person's mobile number.
10. Type in your text and click 'Send.'
Using only your GSM phone
11. Go to 'Menu' on your GSM cellular phone.
12. Find 'Messaging' and then go to 'Create Message.'
13. Enter the international phone number that you wish to send the SMS to. Remember to include the 'plus' symbol and the country code before the mobile number.
14. Enter the text that you wish to send in the 'Text' field.
15. Send the message as you would send any other regular text, by clicking your phone's 'Send' key.

Options for Calling to From Mexico

Types
You can call a landline number in Mexico, which costs less than calling a mobile phone. Calling landlines in Mexico usually costs 4 cents per minute, while calling mobiles costs 20 cents per minute. Cell phone carriers also offer international calling plans, like AT&T's Viva Mexico, which charges $55 a month, and Verizon's Mexico-Friendly calling plan, where callers can opt to extend their nationwide coverage to Mexico for $50-$60 a month.
Effects
Calling from Mexico will help people keep in touch with their family members in the U.S. However, it is expensive to call from Mexico to the U.S.; that's why most of the time, it's those in the U.S. who call their friends and family in Mexico. Calls originating from the U.S. are not without a price though, and although it is cheaper to call Mexico from the U.S., having relatives from Mexico call the U.S. will help split costs.
Cheaper techniques
There are a number of options available for those who want to call Mexico from the United States. Prepaid cards are popular, and you can buy cards with denominations that range from $5 to $20. There may also be cheaper options online, such as using Skype, where you call directly from your computer to phones in Mexico. Skype has international rates for calls originating from a computer to a landline or mobilephone, but you and the recipient can make free calls if you are both online.
Calling From Mexico
One of the popular ways to call from Mexico is through payphone cards, which are also known as 'tarjeta lada.' Since calling from Mexico to the U.S. is expensive, Mexicans find it cheaper to limit their calls to the specified minutes on a card instead of calling direct. Another popular way of calling from Mexico aside from phone cards is through call back services, which charge your credit card directly. Call back services allow you to dial a number, hang up after a ring, then have an operator call you back to connect you to your call recipient.
Potential
With the onset of online telecommunications services, people may be able to call Mexico for free. Rebtel.com, a mobile VoIP provider, has a service called 'Smart Call,' where a person in the U.S. can talk to a person in Mexico for free on their mobile phones. Talkster.com also offers a similar service, where people can make international calls for free by listening to ads.

How to Send Receive SMS Using a GSM Modem

Send SMS
1. Type 'AT+CMGF=1' and press Enter to put your modem in the mode to send and receive text messages.
2. Type 'AT+CMGS='+12345678'' and press Enter. '+12345678' is the phone number of the recipient in this example.
3. Type the text of the message you'd like to send, and press Ctrl and Z keys. The modem will return '+CMGS: 62', indicating that the message was sent.
Receive SMS
4. Type 'AT+CMGF=1' and press Enter to put your modem in the mode to send and receive text messages.
5. Type 'AT+CMGL='ALL''. This command lists the received messages. For instance:+CMGL: 1,'REC UNREAD','+12345678',,'09/09/10,09:55:16+08'Text of message 1+CMGL: 2,'REC UNREAD','+12345678',,'09/09/10,09:56:03+08'Text of message 2OK'+12345678' is the phone number from which the message was sent. 'REC UNREAD' indicates that the message is currently unread. The date and time shows when the message was delivered to the modem by the mobile operator.
6. Delete the messages by typing 'AT+CMGD=1' and 'AT+CMGD=1'. Numbers 1 and 2 are the indeces of the messages as presented by the CMGL command in the previous step.