Using Android Telephony APIs 353

Working with Telephony Utilities 353 Gaining Permission to Access Phone State Information 354 Requesting Call State 354 Requesting Service Information 356 Monitoring Signal Strength and Data Connection Speed 356 Working with Phone Numbers 357 Using SMS 357

Gaining Permission to Send and Receive SMS Messages 358 Sending an SMS 358 Receiving an SMS 360 Making and Receiving Phone Calls 362 Making Phone Calls 362 Receiving Phone Calls 364 Summary 365

References and More Information 365

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