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Need to reach someone outside of the U. Enjoy free unlimited international texting and affordable voice calls. You've got referral credit! Skip to content. Sign in Join Fi. Talk with a Fi expert Chat now. Feature-packed plans that fit your data usage. See plans. Better coverage in your favorite places with 3 mobile networks. Check coverage. Data abroad for the same price as home, and no setup required. See international coverage. Unlimited for 3. You may even be able to heat the solder on that pad from the top of the antenna, the heat can be conducted through the two vias small holes in it.

Solder Jumpers : There are two solder jumpers on the bottom of the board, labelled "Cell" and "uC". Solder the center pad of each to the pad labelled "uC". If you instead solder the center pad to the "Cell" pad, the FTDI cable connects directly to the GSM module so that you can communicate with it from the computer. Speaker : The speaker is awkward to solder because it has no legs. First, apply solder to the pads on the PCB. Then rest the speaker on top of the PCB aligning its pads with those on the board and solder it from the bottom. You can feed in solder or melt the pre-applied solder from below.

If it doesn't work, don't remove the speaker you might rip its pads off. Instead, try to re-melt the solder on its pads by inserting the iron into the holes from below. USB Connector : Only the two outer of the five small legs of the USB connector are used, so you don't have to solder the three central legs. Do solder the four corners, though, they provide structural support. Instead, you can insert pins into the connector on your ISP and hold them against the pins from the top of the board while you burn the bootloader.

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If you have trouble, you can solder pins to the holes but you'll have to adjust the case to make room for it. There are a lot of pieces involved in connecting to the network and, therefore, a lot of things that might not work. If the phone's display shows "connect" forever, it's having trouble connecting to the network. Here are some potential problems and some possible solutions.

If you don't see anything on the display at all, check the soldering on its pins and the pins of the microcontroller, and review the previous step to make sure the software uploaded correctly. Is the SIM socket soldered correctly? The corresponding pads on the GSM module? Is the antenna soldered correctly? The corresponding pad on the GSM module? Is the 0 ohm resistor soldered correctly to the trace connecting the M10 GSM module to the antenna?

Do you have reception? You might try taking the phone outside. Sometimes, even if you can get reception inside, the phone has trouble connecting for the first time when it's inside. Is the SIM card locked to another phone? Serial Debugging You can further debug the phone by communicating with the GSM module via serial communication with the computer, using the microcontroller as a proxy. To do so, upload the SerialProxy sketch to the phone using a 3.

Then open the serial monitor and set the baud rate to and the line ending to "carriage return". Check the status of the network registration connection. The response will be in the form " CREG 0,N", with N being: 0 not registered to a network , 1 registered to a network , 2 searching for networks , 3 network registration denied , or 5 registered, roaming. Display currently-selected phone book.

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You can also replace the "SM" with the abbreviations for the other phone books listed previously. Unlocking the Phone Once the phone successfully starts up, it will be locked and the screen will be blank. To unlock the phone, press any button; the date and time will scroll back and forth across the screen this is the "unlocking" screen. If, during this time, you press the "unlock" key the top-left button , the phone will unlock.

The time will remain on the display, without scrolling.

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This is the home screen. Locking the Phone From the home screen, you can lock the phone by pressing the left soft-key button the upper-left button.

The screen and backlight will turn off but the phone will still be on and able to receive phone calls or text messages. Dialing a Phone Number You can dial a number from the home screen. Simply press the button corresponding to the first digit of the number. You'll be taken to the dialing screen where you can enter the rest of the number. To call the number, press the right soft-key "call".

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Using the Phone Book Contact List From the home screen, press the down arrow the lower of the group of four buttons just below the display to enter the phone book. Also, your phone must be turned on and have an Internet connection.

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The next time your phone is online, these actions will take effect. To prevent anyone from using your Google Fi service, you can put it on hold at any time.

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To resume your service, just go back to the Google Fi website and at the top of the screen, select Resume service. If you use more than one Google Account on your phone, you should change the passwords for all of them. Change your Google Account password. Google Help.