create loop for array to get string from json String?

You should eliminate those calls to allValues and valueForKey, as repeatedly calling those methods is very inefficient ways to tackle JSON parsing.

In one of your comments, you said that your JSON looked like:

{
    "plan_history": [
        {
            "rate": "₹1000",
            "description": "FullTalktimeTopupRs.1000FullTalktime",
            "validity": "Validity: 0\r",
            "plantype": "FullTalkTime"
        },
        {
            "rate": "₹508",
            "description": "FullTalktimeTopupRs.558morethanFullTalktime",
            "validity": "Validity: 2\r",
            "plantype": "FullTalkTime"
        }
    ]
}

(I wonder if there was something before this plan_history entry given your allValues reference, but unless you tell us otherwise, I'll assume this is what the original JSON looked like.)

If so, to parse it you would do:

NSMutableArray *results = [NSMutableArray array];

NSError *error;
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:&error];
NSArray *planHistory = json[@"plan_history"];

for (NSDictionary *planHistoryEntry in planHistory) {
    NSString *rateString  = planHistoryEntry[@"rate"];
    NSString *description = planHistoryEntry[@"description"];
    NSString *validity    = planHistoryEntry[@"validity"];
    NSString *planType    = planHistoryEntry[@"plantype"];

    // now do whatever you want with these four values.

    // for example, I'd generally create a custom object I defined elsewhere for these four values and add to results, e.g.

    [results addObject:[PlanHistoryEntry planHistoryEntryWithRate:rateString
                                                      description:description
                                                         validity:validity
                                                         planType:planType]];
}

// now do something with results, e.g. store it in some property in `appDelegate`, etc.

Where, PlanHistoryEntry might be defined like so:

@interface PlanHistoryEntry : NSObject

@property (nonatomic, copy) NSString *rateString;
@property (nonatomic, copy) NSString *planDescription;  // note, do not use `description` for property name
@property (nonatomic, copy) NSString *validity;
@property (nonatomic, copy) NSString *planType;

+ (instancetype) planHistoryEntryWithRate:(NSString *)rateString
                          planDescription:(NSString *)planDescription
                                 validity:(NSString *)validity
                                 planType:(NSString *)planType;

@end

@implementation PlanHistoryEntry

+ (instancetype) planHistoryEntryWithRate:(NSString *)rateString
                          planDescription:(NSString *)planDescription
                                 validity:(NSString *)validity
                                 planType:(NSString *)planType
{
    PlanHistoryEntry *entry = [[self alloc] init];
    entry.rateString = rateString;
    entry.planDescription = planDescription;
    entry.validity = validity;
    entry.planType = planType;

    return entry;
}

@end

But I don't want you to get lost in the minutiae of this answer (because given the ambiguity of the question, I may have gotten some details wrong). The key point is that you should not be using allValues or valueForKey. Just navigate the JSON structure more directly as illustrated above.

Try this,

NSData *data = [soapResultsString dataUsingEncoding:NSUTF8StringEncoding];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

NSArray *rateArray = [[json objectForKey:@"plan_history"] objectForKey:@"rate"];
NSArray * descriptionArray = [[json objectForKey:@"plan_history"] objectForKey:@"description"];
NSArray * validityArray = [[json objectForKey:@"plan_history"] objectForKey:@"validity"];
NSArray * plantypeArray = [[json objectForKey:@"plan_history"] objectForKey:@"plantype"];

and use rateArray, descriptionArray etc.

You can create a class storing your data as follows:

Something like:

planClass.h
@property(nonatomic, strong) NSString * rateString;
@property(nonatomic, strong) NSString * descriptionString;
@property(nonatomic, strong) NSString * validityString;
@property(nonatomic, strong) NSString * plantypeString;

plan.m
//@synthesize the properties of .h

Now in your .m file where you want to parse the data you can do something like:

    NSData *data = [soapResultsString dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

    NSArray *array = [json allValues];

    for (int i=0; i<array.count; i++)
    {
planClass *pc = [[planClass alloc]init];
        recordResults =NO;
        pc.rateString  =[[[json valueForKey:@"plan_history"]valueForKey:@"rate"]objectAtIndex:i];
        pc.descriptionString=[[[json valueForKey:@"plan_history"]valueForKey:@"description"]objectAtIndex:i];
        pc.validityString=[[[json valueForKey:@"plan_history"]valueForKey:@"validity"]objectAtIndex:i];
        pc.plantypeString=[[[json valueForKey:@"plan_history"]valueForKey:@"plantype"]objectAtIndex:i];
    [appDelegate.arrayPlan addObject:pc];
    }
NSLog(@"appDelegate.arrayPlan >> %@",appDelegate.arrayPlan); // you'll get array of planClass objects

You can now access the arrayPlan declared in appDelegate as follows:

for(id *obj in arrayPlan)
{
    planClass *pc = (planClass *)obj;
    NSLog("rate: %@",[pc valueForKey:@"rateString"]);
    NSLog("descriptionString: %@",[pc valueForKey:@"descriptionString"]);
    NSLog("validityString: %@",[pc valueForKey:@"validityString"]);
    NSLog("plantypeString: %@",[pc valueForKey:@"plantypeString"]);
}

Hope this helps.

you need to store that value in fatalist control means in NSMutable array like this.

 NSData *data = [soapResultsString dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
    NSMutableArray *arrayHistory = [[NSMutableArray alloc]init];

    NSArray *array = [json allValues];

    for (int i=0; i<array.count; i++)
    {
        recordResults =NO;
        appDelegate.rateString  =[[[json valueForKey:@"plan_history"]valueForKey:@"rate"]objectAtIndex:i];
        appDelegate.descriptionString=[[[json valueForKey:@"plan_history"]valueForKey:@"description"]objectAtIndex:i];
        appDelegate.validityString=[[[json valueForKey:@"plan_history"]valueForKey:@"validity"]objectAtIndex:i];
        appDelegate.plantypeString=[[[json valueForKey:@"plan_history"]valueForKey:@"plantype"]objectAtIndex:i];

            [arrayHistory addObject:appDelegate.rateString];
            [arrayHistory addObject:appDelegate.descriptionString];
            [arrayHistory addObject:appDelegate.validityString];
            [arrayHistory addObject:appDelegate.plantypeString];
    }

Now use

arrayHistory

to load data in table view