About the preferred wireless network list.................................................................................................................................................................................................216
Add a wireless network to the preferred wireless network list..............................................................................................................................................................216
Change the order of preferred wireless networks....................................................................................................................................................................................217
Delete a wireless network from the preferred wireless network list.....................................................................................................................................................217
Turn off data service......................................................................................................................................................................................................................................217
About roaming...............................................................................................................................................................................................................................................218
Switch wireless networks manually............................................................................................................................................................................................................218
Verify the status of network connections and services...........................................................................................................................................................................218
Wireless network coverage troubleshooting.............................................................................................................................................................................................218
Power, battery, and memory............................................................................................................................................................................................................221
Turn off your device.......................................................................................................................................................................................................................................221
Set your device to turn on and turn off automatically.............................................................................................................................................................................221
Check the battery power level.....................................................................................................................................................................................................................221
Check the battery power level using a voice command............................................................................................................................................................................41
Reset the device.............................................................................................................................................................................................................................................221
Extend battery life.........................................................................................................................................................................................................................................221
View the amount of available memory on your device........................................................................................................................................................................... 222
Best practice: Optimizing your device performance...............................................................................................................................................................................222
About the SIM card phone book.................................................................................................................................................................................................................156
Add a contact to your SIM card .................................................................................................................................................................................................................156
Copy contacts from your SIM card to your address book.......................................................................................................................................................................156
Copy a contact from your address book to your SIM card......................................................................................................................................................................156
Change a SIM card contact..........................................................................................................................................................................................................................157
Delete a SIM card contact............................................................................................................................................................................................................................157
Store SMS text messages on your SIM card...............................................................................................................................................................................................79
About SIM card security..............................................................................................................................................................................................................................224
Protect your SIM card with a PIN code.....................................................................................................................................................................................................225
Change the SIM card PIN code..................................................................................................................................................................................................................225
Change the display name for a phone number........................................................................................................................................................................................225
Security basics...............................................................................................................................................................................................................................................227
Password keeper...........................................................................................................................................................................................................................................228
Encryption......................................................................................................................................................................................................................................................230
Memory cleaning.......................................................................................................................................................................................................................................... 232
Certificates....................................................................................................................................................................................................................................................233
Certificate servers........................................................................................................................................................................................................................................239
Key stores.......................................................................................................................................................................................................................................................241
Smart cards....................................................................................................................................................................................................................................................243
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
