If you have an LFM SIM and want to use it in a tablet that has 3G, but is not cellular capable (cannot make calls/text via normal mobile/cellular networks), you can convert your credit to data in 2 ways.
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Take a phone with you and insert the SIM into your phone. Send a text to 22213 for the data pack you'd like (more info here).
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When you land, after setting the right APN (info here), navigate to mylfm.eu (free to use with LFM SIM), where you can convert your € credit balance to a data pack.