Question about Symbol MC70

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When mc70 is in standby and receive a sms , says invalid sim

The mc70 wake up, but invalid sim

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Is there a chance the account on your wireless carrier has had text messaging disabled? This is done sometimes to eliminate the cost of text messaging. Who is the carrier?

Also, I've seen something similar to this long ago when dealing with the AT&T / Cingular merger. Some of the "old" SIM cards did some strange things. ATT replaced them but I thought it was a hassle porting the phone numbers.

Posted on Feb 23, 2009

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Posted on Jan 02, 2017

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I cant activate my GPRS to be able for me to browse the net!, i'm using a Globe sim card, I have to type or send to them the type or model of my LG phone or handset when i go to the GPRS settings, but when...


check the GPRS connection settings with your network service provider.
because each mobile phone has its own connection settings, if you are able to call carrier customer service then you should ask them to send you configuration settings via sms according to your mobile model.

Then they should send you the settings and once you receive that sms, you should save them into your device then restart it and try again connecting.

Please send feedback if this solution worked

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Tracking device ?


I do not know your level of experience, but here are a couple of types you could make.....
A lojack-type beacon, with a receiver that beeps louder as it nears the beacon.
A unit that calculates its position by either cell tower triangulation or by GPS satellite. The only issue with this unit is that you need a way to access the information it stores. Some units store the information so it can be accessed later, and some units send the information over the cellular network to the internet.
if you plan on installing this device in a vehicle, the best place to mount the gps antenna would be under the dashboard below the front windshield. GPS antennas can only see through plastic and glass... if there is any metal above it, you will see no satellites. The unit must be grounded to the chassis of the automobile, and it must be connected to a direct power source. To reduce strain on the car battery, this unit should have a standby mode while the car is off... this will necessitate a 3rd connection to the vehicle, which would be the ignition lead. This lead only shows power when the vehicle is started, so it is a good way to tell the unit to wake up from standby. Another way to wake the unit up from standby would be to send it a "text message" or sms, The text message would contain a command to wake up (the standby current could be exactly that of a cell phone), and the unit can send its latitude and longitude via text message. 
That's pretty much it.

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